My Supposed Best Friend?

Well we been fueding for about 2 weeks now. So the other day he Myspaces me and tells me what he thinks so I send him a reply because If we talk in person it will become a fist fight in the street. He then sent me another reply trying to be friendly. So he tells his "Buddy" that I hate him and he told him **** that was twisting my words. But he was trying to apologize so I call the "Buddy" up and show him the Myspace messages. My girlfriend is his sister and she read the messages and watched me type my reply and his as well. Well I show him the messages and he goes down to apartment and Me and my girlfriend listen to the arguement and My supposed Best Friend says I didn't write that **** it's all doctored and changed. He wanted to patch things up with me and my girlfriend but talks **** about both of us again and again after we forgive him but we're not this time.......We have the right not to forgive him and trust him don't we?