One of the most heartbreaking scenes
...is the scene right after Steven gets his car and he pulls up outside his house. He peers inside and sees his family enjoying themselves, his sisters doing homework, etc...the look on his face was one of sadness and despair when he realizes that he no longer knows these people, almost like they are strangers to him and he is an outsider looking into a normal family dynamic that he never knew. Unfortunately, Steven was damaged beyond repair at this point.
Also that talk he had with his mother at the end of the movie had me in tears. He is trying to explain to her, that his childhood was tragically severed and the little boy that she once knew and loved...is gone forever.