Cristina isn't speaking to Owen, who reveals his infidelity to a clueless Meredith. Needless to say, this little newsflash doesn't go over well. It leads to some awkward moments in the OR. Later, Meredith says that the reason Cristina didn't tell her about the affair is because she didn't want her to hate Owen. That means she may be trying to forgive him. We're just wondering if the bowl of cereal Cristina tosses in Owen's face is all part of the healing process.
Lexie overhears Mark say that he's considering asking Julia to move in with him. She turns to Derek for advice. That's a mistake. Relationships are not things these two talk about. Nevertheless, Lexie can't help wondering aloud if Mark is her soul mate. Derek can't take it anymore. He tells Lexie that the only thing that would stop Mark from moving in with Julia is if he thought he still had a shot with her. That's why Derek wants Lexie to be sure she wants him back.