Mark finally admits this fact, and ends up getting punched. Possibly a bit of an overreaction on Derek's part.
Added:
Mark and Addison used to have a thing. Now the only thing they are worried about is saving her brother's life.
Added:
Mark and Naomi converse in a scene from "Before and After," from Season Five of Grey's Anatomy.
Added:
We all know what that look Lexie is shooting Mark says. Or at least we think we do. The episode will prove it one way or the other.
Added:
Will Mark and Lexie go public with their relationship? Do people like their relationship? We don't know, but it will be interesting to find out.
Added:
A nice picture of Callie, Lexie and Mark at the bar in "Beat Your Heart Out," from the fifth season of Grey's Anatomy.
Added:
Derek looks on as Mark and Lexie gaze upon each other in "Beat Your Heart Out," from the fifth season of Grey's Anatomy.
Added:
Mark and Lexie in "Beat Your Heart Out," from the fifth season of Grey's Anatomy.
Added:

Grey's Anatomy Quotes

The first time I kissed my wife, she wasn't my wife then, she was just this girl in a bar. But when we kissed, it was like, I gotta tell you, it was like I'd never kissed any other woman before. It was like my first kiss. The right kiss.

Derek

[narrating] "At some point, you have to make a decision. Boundaries don't keep other people out, they fence you in. Life is messy, that's how we're made. So you can waste your life drawing lines or you can live your life crossing them. But there are some lines that are way too dangerous to cross. Here's what I know. If you're willing to throw caution to the wind and take a chance, the view from the other side... is spectacular."

MEREDITH