My friends bf and I don't get along....?

The generational and maturity gap between a 16 yo and 25 yo is HUGE, there is no "love" there, but more than likely a naive little girl that wants to feel grown up with her douchey older boyfriend, who tells her what she wants to hear. There are probably some serious mental issues with this guy. Chances are, if he's controlling her this much, he's probably being abusive and/or controlling behind closed doors. I'd be genuinely concerned for her safety, and I kind of wonder what her parents are thinking letting their daughter be with this guy.