My best friends dirtbag boyfriend?

Well one of my best friends has been dating this dirtbag for like months. And hes txtd other girls that he likes them. And he's told the other girls that hes only dating my friend because of her body. And i can tell thats true by the way hes touchin her :P But she's crazy about him. And anytime me or anyone else tries to talk to her about it she ignores us like we dont know anything. I know its ge life but ALL and i mean ALL of her friends hate him. Including me. He's a player whos a pervert. Please please what shud i do?! Their relationship is disgusting! Tell me how to get to her! Please help! Thanks :)