Yes, 21 across was Ben's way of proposing. At home, Bailey asks him to propose to her again. He's reluctant to do so because he just got a call to be a surgical intern at UCLA. Ben says everything is different now. In other relationship news, Mark responded to Lexie's declaration of love for him by thanking her for her candor. Mark's dilemma is that Julia will give him everything he wants, but he's in love with Lexie, who can't do that.
Derek wants Meredith to take the job she's been offered in Boston. That's because he as a $10 million dollar endowment offer from Harvard. They'll set him up with a full research team so that he can fulfill his dream of curing Alzheimer's. Meredith eventually let's Cristina know she's going to Boston. We see her sitting on a plane next to Derek. A short time later, we see Meredith lying on the ground. She's hurt. The plane she was on has crashed. Unfortunately, that's all we know at the moment.