Well my best friend has a girlfriend who I really likes but my best friend just so happens to be the guy I would do anything for I don't know no what to do I could easly break them up if I wanted to but I don't no my best friend me and him are like brothers I don't know what to do

Break them up for what?
Because you want her?

Don't do it seriously I am in this situation right now my boyfriends best friend pulled my dress down and tried to do something I thought he never would and as I was pushing him away and pulling my dress up my boyfriend walked in, now I have lost every thing due to this "friend", my boyfriend has always been paranoid and thinks because of what he saw that I was doing something with his mate even know I have told him the truth,
I don't ever want to speak to this "friend" again and I know that my ex doesn't want to either.

You will just end up losing every one close to you and its not fare to put your friends through heart ache all because you like her,
Be a friend and leave them alone