Oh, I misread the question as "get back AT", you have my sincere apology for the misunderstanding.
As far as reconciling with your friend, part of growing up is learning how to be the bigger person, learning how and when to set aside your pride and recognize that there are times when everyone is wrong, and petty feelings should not come between an otherwise good friendship.
The Wizard's Third Rule states that "Passion Rules Reason, for better or worse." and this warns us to apply forethought to our actions and to never react out of emotion. A harsh tongue is easier slipped than a reasoned and rational response. Because it is so easy to lose control over our emotions, it makes it all the more important to work to control them.
Sit down and think about the conflict, remind yourself of how it went and see if you can bring yourself to take a deep breath and choose the friendship over the fight. Would your life be better by staying in this stalemate or would you be happier by making up with your friend?
If you would like to discuss this any further, my inbox is always open.