Dont just hate it when....?

To be honest, if your boyfriend won't believe you, I'd just say screw it, I don't need this BS. If you really like him and want to be with him, just ask him. Ask him why he says the things he does and why he doesn't believe you? Maybe he's insecure and afraid something just might happen. Alot of times it's easier for people to be rude and blow others off before something ever happens because they just can't stand how they would feel if it actually DID happen.