Teddy catches Mark in bed with Reed and we have to laugh at how Mark handles it: He suggests a threesome! Meanwhile, Lexie asks Alex, "Are we a couple? He kisses her and says, "Yeah, we're together. We're a thing."
Owen asks Cristina to move in with him and she plans on saying yes, until Meredith suggests that there's something going on between Teddy and Owen. Cristina demands to know what Meredith knows, but since her information comes from Derek, she can't. Derek warns her, "You can't tell Cristina." Instead, Meredith confronts Owen, telling him, "I know you tried to have Teddy fired and I believe it's because you're in love with her. You will tell Cristina, if you're actually the good guy that she thinks you are."