I had no idea what to do with myself. Meredith had quit speaking to me entirely, and Addison just called to say she had landed in Seattle. A small part of me wanted to see my wife and unborn child, but Meredith would be furious if she knew I was going to pick her up at the airport. I drove along the highway trying to decide if I wanted to hurt Addison or hug her. All this time I had been so angry at her, but after talking to her, I realized just how much I missed her. I watched as she entered the airport from the gate. She looked amazing, as usual.

"Derek!" she spotted me watching her. "I didn't expect you to come get me!"

"Well, I didn't want you wandering around the city and getting into trouble," it was then that I noticed the tiny bulge around Addison's middle.

She blushed when she realized I was looking at her stomach. Seeing my unborn child brought about a rush of emotions that I tried to hide. There were so many things I wanted to say to her. I wanted to ask her why she had slept with Mark, but the biggest question was why she waited so long to tell me about my baby.

"Derek! Stop staring."

"I'm sorry. Here, you shouldn't be carrying those bags," I took her carry-on bags from her.

"Thanks," she smiled nervously and an awkward silence followed.

"Ahem," I cleared my throat. "How…umm…how far…"

"About 15 weeks."

"Oh. Wow. Why didn't you tell me?"

"I tried, Derek. I called you and paged you so many times. You never answered."

"You never left a message."

"Did you really want to find out about your son by a message on an answering machine?"

"Well, no, but…"

"See. You wouldn't have returned my call anyway. Give me my stuff. I think I'm going to take a cab."

"No, you're not. And I would have returned the call."

"Don't lie to me."

"It hurts, doesn't it?"

"You did not just say that. I didn't lie to you."

"So, what do you call having an affair with my best friend?"

"It only happened that one time! Here," she pulled a manila envelope from one of the bags.

"Divorce papers?"

"Yes. I stayed with Mark after you left. At first I felt really bad about it, but then I found out about your girlfriend in Seattle. The way I see it, we're even."

"But she isn't your best friend," I knew Richard had ratted me out.

"I'm sorry about that. I truly am sorry, but he was there for me when I was so lonely. You…"

"I was never there. I know. We both made some mistakes."

Suddenly, her eyes grew bright. I set her bags next to my car and reached out to her, touching her for the first time since I left New York. I took her by the hands, but she pulled back. I let go, only to have her lean into my chest. Not knowing what else to do, I put my arms around her.

"Why are you crying, Addie?"

"I planned on yelling at you and you yelling back or not speaking to me and you being really mad at me and you just admitted something I wanted you to admit a year ago!" she wailed.

"We both screwed up. I know that."

"I screwed up bigger," she sniffled.

"Maybe so, but I still should've been there for you. I still remember about when everything changed. What happened?"

"You started ignoring me."

"You withdrew from me, and I didn't try to bring you back. I didn't know how to help you, so I pretended everything was fine. What caused it?"

"Promise you won't yell?"

"I promise."

"My nephew died on my table."

"Addie! Why didn't you tell me?"

"I didn't want you to get mad at me for operating on a relative. And you did yell."

"No, no. That wasn't yelling. When was this?"

"Seven years ago."

"But we were fine after that," I had expected her to say something more like two years ago. "Addie, you were a fellow then."

"I know, but my sister wouldn't have it any other way. I tried to deal with it for a long time. That's why I was hell bent on saving all my patients," she had a faraway look in her eye, the look I recognized as a dark, sad stare.

"Did something else happen?"

"On what should've been my nephew's fifth birthday, I had another boy with the same condition and prognosis. He lived. He lived and my nephew didn't, and it's all my fault!" she had begun to cry again.

"Addie, it is not your fault!"

"Then how come I couldn't save my nephew? Everything was exactly the same. Why did he die?"

"Everything was the same except for the fact that you had five more years of experience as a neonatal specialist. Look at this way, when you faced the situation a second time, you knew exactly what to do. You saved the child of a family who might not have been strong enough to survive his death."

"Thank-you."

"For what?"

"For listening and being there."

"When is your nephew's birthday?"

"The…uhh…the day I…umm…"

"Oh. Okay. Addie, I'm so sorry," it was then that I knew what I wanted to do.

"I'm sorry, too."

"Do you want to try this, us again?" I held out the divorce papers.

A/N: Mark or Derek? Mark or Derek? Whom shall I choose? Up next: Addison makes her decision.