I think this book really tells you about the power of friendship and what it's like to deal with loss. The loss of Leslie was really sad for Jess and he knew he would never forget her. Jess will never forget her because of the friendship they had. He has a blank place in his mind that he wants to close and I think that's why he acts the way he did. Even though at some points after Leslie dies Jess says he hates Leslie but I don't think he does. Personally, I think the brige to teribithia is actually a bridge connecting them when she is in heaven.