[Axiom]

I just found out today that my supposed "best mate" has been backstabbing me and my other mates for several months because he's been trying to steal my girlfriend off me. He's been slating us behind our backs for ages for some reason - don't ask me why because I dont know. I knew he was untrustworthy because he used to be 2 faced a few years ago but I gave him a second chance. He's such a ****ing insecure tosser!!!! He's such a saddo. He doesnt know I know yet btw...what do you guys think I should do? I'm fuming here lol!