It's bad to fixate on someone after they reject you.
Gerry has asked Stacy out on a date, but Stacy turned him down.
Gerry wants to respond to the rejection.
Gerry takes the rejection in stride and moves on with his life.
Gerry obsesses over Stacy's rejection and begins to stalk her trying to get her to go out with him.
Gerry finds someone else he likes, and that doesn't reject him.
Stacy calls the police, and Gerry is charged for stalking.