It's OK hun .

You have been given so much good advice, but I just wanted to say getting him to do some sort of "community service" to the school is an excellent idea. You can give him the chance to make it right. He can absolve himself, he can work through his feelings whilst he is at it.
Its not about shaming him, but sometimes when we are truly sorry it can help to visibly do something as well as apologise.

xoxoxoxo