How to rebuild a friendship?

Broaden your understanding.

Of course, when you’re furious, it’s hard to see the other person’s point. But do try to understand why your friend sees things differently. Remember that you have always respected your differences, and from there try to see how and why things went wrong between you and your friend.

You are sure hate your friend less once you remember that she has her opinions too which deserve your respect.

Ask yourself what is more important to you — the friendship, or your pride?

See things in a bigger picture and realize that if you keep up the coldness between you, you might just lose the friendship all together. Over time, it wouldn’t even matter whose fault it was, or what was it you fought about. Why lose a friend when you can humble yourself and apologize first, regardless of whether or not it’s your fault. Apologize because you have said things which are more caused by anger than by reason.

Talk things over.

When you have finally forgiven each other for all the things you’ve said and done against each other in the course of your fight, discuss the reason why you argued. Friends usually drop it, thinking they’ll forget their issues easier if they stop talking about it but actually it only gets fully resolved if you discuss things when you’re both level-headed. The point of this discussion is to make sure that you don’t fight over the same thing again in the future because you have settled it and talked maturely about it.

http://www.lifespy.com/2007/how-to-rebuild-a-damaged-friendship/