the last but the best part of Good Will Hunting

I always cry at this scene of the movie. Will came to Lambeau's office. and Will confessed abused his boyhood memeries by his father. Lambeau whispers. "It's not your fault." and will replied pretending to look casually. "I know."
Sean, again, said "no, no, you don't. It's not your fault. Hmm?."
after hearing a couple of 'It's not your fault' by Sean, Will look dead serios and said " Dont fuck with me." while he is sobbing.
and finally Sean takes Will in his arms and holds him like a child. Will sobs like a baby. This is a climax of this movie.