Is this the movie?
Lately I've been looking up movies and TV shows I used to watch as a child. I think this is one of them, but am unsure.
I remember there being a relationship between two classmates in a school. From what I've read about this movie, that's obviously a part of this film.
The only other thing I remember is a scene that takes place around a lake. Maybe the two boys are swimming in it? I recall a tree with a large branch that extends out over the lake, with one of the two boys lying on the branch.
That sounds kind of vague, but could this be the movie? :)