Stab her first

You should get in touch with his ex girlfriends (if he got any) as they probably got threatened too. They might agree to be on your side and talk to him, hopefully opening his eyes on his "best friend"

Manipulative bitch. That's horrible. She's probably feeding your boyfriend lies. It will be best to do something about it soon. Untouched, it will get worse. She'll only push you around more if you let her. He'll find out eventually. I'm sorry. :-(

The next time your around here press record on your phone and put it in your pocket

don't get close to her as in never talk to her unless he's there if she tries to make up shit it'll be less believable if she'd have no reason to know anything about you

Don't bring it up any more to him. Have your phone recording while pretending to browse fakebook or something. Don't over/underact your fake browsing. Act like you normally would. Only do this when youre just hanging out doing nothing. Friendzone will say something if he leaves the room. Boom.proof

OP, i'd say kill the bitch, but you may be against murder. Anyways, I would say talk to her and use a voice recorder on your phone or something and play it to him. Or film her while you're talking to her so he knows its authentic. This will be the best for you and him. If she's that crazy, who knows what she could do to him!

Welcome to Australia. :|

Pretty sure I wouldn't wanna be with him. He doesn't trust you, and his BFF is certifiable!

Give him the choice of you are her , he should believe you no matter what , that's what love is about