When Gabe dies, Percy is ecstatic. He missed him sometimes, but most of the time, he was happy. The abuse was gone. Well, Sally started seeing other men. So Percy did, too. Not really. In his dreams. But in reality, he was lonely. When Luke is taken by Kronos, it's also when Paul and Sally decide that he should move in. Which Percy wasn't too happy about. Paul is a teacher, and Percy is a natural troublemaker. On top of that, he looks like he dipped his wardrobe in punk and teen angst. They constantly argue, and he's not getting help. But, against Percy's request, they get married. It doesn't get better. The arguing still continues. Percy continues to act out. And when Luke died, Percy lashes out. Luke was his hero. His will to live. And he's gone.