The seniors graduate, this is going to have a huge effect on Charlie's life.
Charlie starts to become very lonely and gets scared thinking about the fact that his friends are going to college and leaving him behind.
Before leaving for college, Sam invites Charile to her house to help her pack, in the mist of this, Sam and Charlie begin to make out. This instantly brings him flashbacks of when his dead Aunt Helen used to molest him.
Charlie's parents rush him to a mental hospital from being depressed and finding him unconscious naked on the sofa. At this hospital, he realizes that he was sexually abused by his Aunt Helen.
Charlie is released from the hospital 2 months later. He decides to stop writing to the unknown character hes been writing too and continue to live his life.