I know this guy for about two years now. I met him through a friend anyway he is really mad at me right now.He has a girfriend who has spread some lies about me to him. This girl is really bad news. His family can't stand her. Anyway he was really a nice sweet guy who has turned into someone who no one recognizes anymore.His family says he changed a lot after going back to this woman. So my question is how can I convince him that it is not true what she said about me. How to get him stopping being so mad at me.Or should I just leave things alone and let him realize all this on his own.

If you have told him the truth and he refuses to believe, he is not your friend.

You can't make him realize that you're telling the truth; he should trust you. That's what friendship is: trust.

Leave him alone. Sometimes tough love is the best answer.

I'm sorry that you're dealing with this.

Yeah leave him alone about it. I tired to tell my cousin that the girl he was with changed him and he wasn't the same funny, stupid(in a good way) guy anymore. And that we did not trust her. He practically ripped my head off when I told him. 5 months later he realized she was stealing from him and he dumped her and apologized to me.

Sometimes people don't want to see what is wrong they have to be punched in the face on their own by it.

Leave him alone to face the consequences of his own actions. You can't save a fool from himself, no matter what you do.