Derek had been so certain Addison would slap him or some other negative response that he almost didn't know what to do. But, just as he'd begun to sink into the kiss and accepted the reality of it, Addison had placed two hands on his chest and pushed him away. He'd stumbled slightly, but she hadn't pushed too hard.

He looked at her in surprise, his mind whirling, and then he dropped his eyes to the floor as she suggested leaving. She'd been doing that the entire time, looking for an out. He didn't know if it was because she was still so disappointed in him (kissing her would have only magnified that if it was the case) and was just looking for a way to leave him. Or if she was trying to respect him and give him the space he'd been looking for for months. He hoped it was the latter, although he now wasn't sure that was what he wanted.

"I... I thought you were staying," He said patheticaly stepping backwards and sitting on the edge of the bed.

Addison sighed and looked at him sadly. How she wished he wasn't drunk at this moment. Maybe sober Derek could at least explain to her what was going on; that is, if sober Derek would be willing to talk to her at all. Why did he have to go and get drunk? Things would be so much clearer had his actions made any sense whatsoever, but they didn't. They didn't correlate in any way.

Derek seemed like he couldn't make up his mind. He hadn't been good at that since she'd arrived in Seattle, but this was just ridiculous. Drunk or not, that kiss was prompted by something in Derek's mind, something that may still hold her as dear to him, but why? He was in love with Meredith Grey. He had made that very clear when he decided to engage in intercourse with her at the prom. But now he'd broken up with her, gotten completely plastered, and kissed Addison, his soon-to-be ex-wife.

It didn't make any sense and Addison couldn't be any more confused. Derek had his fair share of being utterly unpredictable, but this was a whole new level of surprising.

"What are we doing, Derek?" she asked, shaking her head slightly as her eyebrows furrowed questioningly.

Derek shook his head. She had to ask the most difficult question possible. The question he didn't have an answer to. Because his world had pretty much been turned upside down. Everything he'd thought he'd known since he'd found Addison and Mark in bed together seemed to be completely wrong.

"I don't know, Addison," He sighed, "I'm not supposed to care what you think. I'm supposed to be with Meredith. But I do, and I'm not. I cannot stand the fact that you might be disappointed in me. All I know is that everything seems to be different. And I don't like to sleep alone."

He paused before clarifying, "Without you."

Addison let out a sigh and closed her eyes, tucking her hair behind her ear. She leaned her back against the door frame and stared aimlessly at the wall opposite her, a look of utter pain and confusion playing across her face.

Why did he have to do this to her now? She had just begun to make progress in accepting that he and Meredith were an item. As much as that had hurt, she'd accepted it. He loved Meredith; Addison knew that, everyone knew that. But now, he was almost making a 180 degree turn, and she didn't know what to do. Addison was so set on getting ready to lead a life without being a Shepherd, without Derek as the man she would grow old with. And now, he was telling her that he cared what she thought, that he couldn't stand her being disappointed in him, that he couldn't sleep without her.

What was she supposed to do? Was she just supposed to believe him? Could she just hand him her heart again and risk having it getting broken? Was she supposed to expose herself to all the possible pain he could cause her?

No, Addison had told herself she wouldn't let him do that again. She wasn't going take it anymore. She'd paid her dues and more. It was Derek's turn to give up something; that is, if he were truly sincere (she was sure he wasn't and that it was just the alcohol). No matter, she wasn't going to let him hurt her anymore.

"I'm sure you slept fine with Meredith," Addison said, her gaze still transfixed on the wall across from her.

He winced as she spit out that suggestion, but he couldn't really argue. He deserved that and much worse.

She wouldn't just take his words. Derek hadn't learned the right for Addison to trust him that way. He'd been using words to keep her with him, while treating her horribly for months now, and he wasn't even sure what to tell her now, what words to use now. Because he honestly didn't know what he wanted, but it was starting to feel like it was Addison.

"Please, Addie," He said softly, "Don't say that. I meant what I said. I don't know what to make of it, but I do mean it."

With a sigh, Addison crossed her arms over her chest and turned her head to the side to look at Derek. He looked so genuine and sincere, more now than all of the other times he'd acted this way since coming to Seattle. She was so torn apart inside, her thoughts and feelings split in two.

As strong as Addison wanted to be, as much as she wanted to keep herself from getting hurt again, she couldn't help but want to believe the things he was telling her. A part of Addison wanted for it all to be true so they could use that to bring them closer together again. She wanted him to care and to realize that 'Addison and Derek' was never supposed to end.

But she couldn't. Addison couldn't give in to the prospect of happily ever after because she knew it didn't exist. There would always be problems, and for them, some of the problems may be too big for them to overcome. She had thought that they could get passed everything with Mark and that they could forget his interaction with Meredith, but she'd been proven wrong. Logic told her that there was no reason for her to hold onto whatever hope she had left.

Her eyes began to water and a tear rolled down her cheek. It was over. "It doesn't matter what you make of it, Derek. We're getting a divorce." Her voice was low, her acceptance of what had become of them shiny through. It hurt, but it was the truth.

Derek sighed. He honestly didn't know how to argue against what Addison was saying because he wasn't sure it wasn't true. They'd be signing the divorce papers in just days, and their marriage would be over. He had no idea how much had to be different before it changed that. He couldn't change things on the simple fact that he suddenly cared what Addison thought and wanted to sleep with her in his arms. The wounds were certainly too deep for that.

He looked up at her, their eyes meeting for the first time since Derek had been sober enough to really see her. It hurt him to see the pain in her eyes. She really had given up (which was something he should have seen coming long before; it was time for her to be strong and give up). He hated to see that. Hated to see his Addison so beaten that she didn't have any fight left in her.

But he still didn't know what to say. He was drunk, tired and completely at a loss for what he wanted.

"Just... stay, Addison. Stay, even if it's only to take care of me one last time."

Addison let out another sigh as she stared into his eyes. She couldn't say no to him. She couldn't pass up 'one last time.' The last time, they didn't know it would be the last time, and she knew that she'd regret not having taken this chance to enjoy being husband and wife one last time if she left right now. Addison had learned to take what she could get from Derek over the past few years of their marriage, and right now, Derek was asking her to for the night.

It was ironic how he wanted her only when they were about to be split apart. All the years in New York when he only cared about work to all the months they'd spent in Seattle, Derek had ignored her, been indifferent towards her. She stopped mattering to him, and now, after all of that, when she'd finally given up trying to win his love, he wanted her to stay. None of that was fair to her, but she couldn't do anything about it and she couldn't refuse him now after all that longing and fighting.

Her gaze shifted to the floor and she closed her eyes, taking a deep breath. "Fine," she said quietly, leaning her head back against the doorframe.

Derek smiled, at least she'd be here one last time. That was comforting. He still didn't know what any of it meant, but he could figure that out. With time, he was sure he would know. At least he could have Addison tonight, be married one more time before it was all over.

He looked at her, frustration and confusion written across her entire face. For a moment, they both said nothing, Addison keeping her eyes closed and head resting against the wall and Derek watching her.

He finally whispered a grateful, "Thank you."

Her eyes opened at the sound of Derek's voice and she turned to look at him again. She smiled softly at him, her eyes filled with a mixture of pain, sadness, and hope.

It's just one night, Addison told herself. She had established that she wasn't going to let him hurt her again, but it was still difficult to suppress the hope that she felt. For once in a long time, he actually wanted her to be with him, even if it was just for one night. A part of her wanted to believe that that meant something. She still wanted to believe that they could somehow work everything out. At this point, it seemed like it was impossible, but she couldn't stop that optimism she still had in her.

Addison fought those thoughts as best she could. It was hard but she wasn't going to let herself get hurt by Derek again. Enough was enough, and she was done fighting.

"You should get some sleep," she said quietly as she continued to just watch him for a moment.

Derek nodded; she was right. He had work in the morning, and a hangover was sure to be there. Sleeping would help to metabolize the alcohol and take the edge of, but Derek didn't really want to sleep.

Sleeping would metabolize the alcohol. Stop it from numbing the pain. Sleeping would also bring the night to an end. It would force both himself and Addison to face the very real reality that tonight was over, and they couldn't hide behind the excuse of "taking care of Derek."

He would have to figure out why, after so many months, he was suddenly ending his relationship with Meredith because of something Addison had said. He would have to figure it all out, and sleeping would only speed the process along.

But she was right, and he nodded, reaching up to unbutton his work shirt.

"You should, too."

"Yeah, I will," Addison said with a nod. "I'll just uh...is it okay if I borrow something to wear for the night?"

She pushed herself off of the wall and took a step closer to him. This was all so weird; being stuck in this sort of limbo. They were still married, but they wouldn't be for long. Knowing that fact, determining whether to act as a married couple or just two people trying to lead separate lives was a feat in and of itself. It was their last night, so they should continue to be the married couple. However, the end was coming soon, so they should start getting used to not being married anymore.

Addison sighed and looked to Derek who was still undressing. She would let him decide what to do with this as well.

Derek was momentarily surprised that she had even asked. More than a few of Derek's shirts had spent more time on Addison's body than they had on his. She slept in his clothing; it had been that way since the very beginning. So it was just a little bit odd for Addison to be asking, but he sort of knew why. So he nodded slowly, tossing his shirt aside and reaching to unbutton his jeans.

"Sure, go ahead," He sloppily motioned in the direction of where his shirts were hanging, though she didn't really need to be reminded.

Addison wordlessly went and picked out one of his shirts to wear, taking the liberty of grabbing a pair of boxers as well. She thought about going into the bathroom to change, but it was their last night and he seemed to want to continue their married ways, so she began to undress and change into his clothing.

Changing in front of Dere felt weird, namely because she knew the last person to see that much of her was not Derek, her husband, but instead was her husband's ex-best friend. She felt guilty. She felt dirty. They were never supposed to end up this way. 'Addison and Derek' was never supposed to end up here in this catastrophe that the two of them had created.

Derek's eyes found their way to Addison as she changed into his clothing. It was simply habit, he told himself. She was his wife, after all, and he'd been watching her change for years. The sad look in her eyes reminded him that this would quite likely be the last time he would be able to watch her.

He sighed, his eyes still on her as he slipped off his jeans. It wasn't supposed to be this way. He wasn't supposed to be sad or longing over the loss of Addison. That had been the goal for months now. And, now, he was watching her and sad that it would be the last time.

He shook his head. This was simply far too confusing. He reached out for her hand because it was a comforting action, and he needed the comfort.