Great movie primarily because of the actors, especially the two who play the central characters.
The plot is a bit contrived though entirely plausible. I don't think it's necessary to look for any deep meaning in the behavior of those involved. Obviously a tragedy occurred and it was bound to have a profound effect on all involved and it was something that would not have been fully explored between parents and the very young boys at the time.
Likewise it would have been a painful jolt to all involved when it suddenly resurfaced again as the two young men fell for each other at school. Forgiveness and rational thinking are easy to expect in theory, but far more difficult to deal with in reality. One thought that never seemed to have arisen was whether blame should have been shared between both mothers ... Christopher's mother who was driving the car that struck Benny's brother and Benny's mother who apparently allowed the child to run out in front of the car.
We never know how long the relationship between Benny and Christopher lasted. The shared tragedy might have been overcome by love and forgiveness, but it would always be a burden that would weigh on them both.
It was a well done bit of drama and romance, but it was not anything from which profound meaning could be extracted.
