What Happened Last Summer?

Everyone knew that she loves him, even he knows. But he doesn't know he feels. His past is the only that holds him back from falling in love with the girl of his dreams. Only 2 other girls know what happened to him. What if one of them caused it to happen? "We haven't talked at all during the summer and now you are acting like this. What happened to the boy I used to know?" "If only you knew, you'd kill her."