My best friend wont believe me? 10 points for best answerr?

I had the same problem. You suppose to be her friend and she won't believe you? Well you need to tell her one more time that Matt is talking about her. And if she doesn't want to believe you then let it go. Tell her if she want's to be made fun of then that's her but you won't continue wasting your time trying to defend her. But even though you tell her you not going to waste your time tryna have her back still stand up for your friend because eventually she'll find out and yall will be even more closer cause she'll know you had her back the whole time. But when you tell her tell her in a friendly tone so she doesn't take it the wrong way.