Answer:
you have to give them some time before trying to make up- some people have to calm down before seeing their ex-friend. try to say sorry and if that doesn't go to plan, show them that you mean it, and that could mean doing something that you have never to before that they like, e.g. swimming 10 metres or if their birthday is coming up, surprise them. they are lots of ways to make up but somethings there is a time for things to happen.
hope this helps