What do you do when ur friends an A$$ to his gf?

tell ur friend that hes lucky to have someone like her, and hes extremely lucky that she hasn't left him because of him cheating and talking down to her. Coming form a woman's point of view i think you should tell her how you feel in an not so alerting way such as saying to her ' if i was your boyfriend i wouldn't treat you like he does and ill tell you that you are the most perfect girl in the world" something along those lines so she doesn't freak out. But if i was her i would have left him along time ago. if they do fully break up don't make your move 2 fast or 2 slow coz she'll be gone.kudos to you though and i hope it all works out for you.