Richard is upset when he finds Adele in bed with another man. His name is Alan. His Alzheimer's is much more progressed than his wife's. The truly depressing thing is that Adele believes she's in love with Alan. She lights up whenever he sees him. She barely knows who Richard is anymore. That's why he regretfully, painfully leaves her to spend her days with Alan, as he's the one who now makes her happy.
The fifth years are interviewing for post-residency positions all over the country. Cristina is in the highest demand, as hospitals are sending her gift baskets. April's perky personality may be her downfall in the interview process. At least she meets with some decent hospitals, which is more than Alex can say. Arizona has been recommending him to lame places so he'll stay put.
Jackson is upset because his interviewers are only interested in him because of his family name. As for Meredith, she interviews at a hospital in Boston. It's her first choice for a post-residency program. That means she may leave Seattle Grace someday. And she may not be the only one.