My best friend/sister needs help

Ok so my best friend/sister is dating this really awful guy, who lies, cheated on her, is a non-virgin,he's kinda ugly 2,says ever freaking cus word in the book,im pritty sure has gotin drunk before to, anyet she stil likes him what should I do? I love her (like a sister) so I dont want her to get hurt. What should I do? Please help me! I dont know what to say 2 her bout that?? please please help me with this??

I know how you feel the best way is to let her learn from her own mistake. keep an eye on her so it doesnt get too far but if he isnt hurting her or anything like physically then let her learn from her mistake. I know its ganna be hard but thats the only way. hope I helped ~kaitlyn~