what to do what to do

I'm in a bit of quandary. There has been a misunderstanding b/w me and a friend and one of their friends. I was accused of something that the friends' friend did. I've made attempts to straighten this out - but my friend only 1/2 listened. My friend still thinks I did something and was disloyal. So I don't know what to do...I think my friend should know what their friend did, but they've already made up. The truth shall set you free right? The problem is - my friend doesn't want to hear the truth. Any suggestions?