Mark finally admits this fact, and ends up getting punched. Possibly a bit of an overreaction on Derek's part.
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Mark and Addison used to have a thing. Now the only thing they are worried about is saving her brother's life.
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Mark and Naomi converse in a scene from "Before and After," from Season Five of Grey's Anatomy.
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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.
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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.
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A nice picture of Callie, Lexie and Mark at the bar in "Beat Your Heart Out," from the fifth season of Grey's Anatomy.
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Derek looks on as Mark and Lexie gaze upon each other in "Beat Your Heart Out," from the fifth season of Grey's Anatomy.
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Mark and Lexie in "Beat Your Heart Out," from the fifth season of Grey's Anatomy.
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Grey's Anatomy Quotes

Just because we can live without something, it doesn't mean we have to.

Meredith

Derek: I am calling post-it, Zola, Bailey, the tumors on the wall, ferryboat scrub caps. I thought D.C. was everything. I was wrong. You... you're everything. I love you and I'm not going to stop loving you. I can't live without you. I don't want to live without you, and I'm going to do everything in my power to prove it.
Meredith: I can live without you, but I don't want to. I don't ever want to.