Describe Lissa's relationships with boys in Chapters 15 and 16.

In Chapters 15 and 16, Aaron breaks up with Mia to be with Lissa. Mia is hurt, as is Christian who liked Lissa. Rose tries to get Lissa to leave Aaron, knowing that she doesn't like him, but she refuses. Rose admits to Christian that Lissa never said that he was a freak, and apologizes. Rose tells Christian that she thinks that he is good for Lissa, and that she wants them to get back together. Christian tells Rose that he doesn't like the new Lissa.