At the end of the book Bridge to Terabithia, Leslie drowned in the river to Terabithia because the rope is not enough solid and it snaped. Jess was very sad, so he build a wooden bridge over the river and there won't be dangerous anymore. His sister May Belle and he became friends.
Before Leslie met Jess she does not have any friends to play with. Her classmates think she is a weirdo and she is an outsider of them except Jess.
Although Leslie is an outsider of the class, but she is not sad, she's still happy. She also made her best friend, Jess happy and she teached him to open his mind. She is like an angel came into Jess's life and just for change him and then she will go away.
When Leslie passed away, of course Jess is so sad. But Jess will become more strong and more happy when he face the difficulty and he won't give up. In some way, Leslie's spirit is still with him.
This end for the book is not perfect, but I think it is beautiful, isn't it?