What would you do in this situation?

If you hurt someone and they dont want to be friends anymore, there's nothing you can say to resurrect the friendship. I've had people hurt me too and acceptable their apologies/excuses and I'll be civil when we're around. But if I cant trust you or count on you, you cant expect the friendship to go back to where it was, ever. I suggest you move on but learn from this. You're still young and there are many lifetime friendships ahead of you.