Best friend's boyfriend is being a jerk to her...?

ok so my best friend has been with her boyfriend for 5 months. when they first got together i heard stuff about him how he sells drugs and how he's a man skank. he even told my ex that he's been with more girls than he can count on his hands %26amp; toes [he told her that he's only slept with 2 girls]. i told her about that but she didn't believe me. she told me yesterday that he wanted to take her out to eat but she couldn't cause she would be busy with school %26amp; he told her whatever bye. then he told her f*ck you %26amp; she told him f*ck you back. she told me they fight like this all the time but it her hurts her feelings when they do. anything she says on facebook it's always about him. i'm afraid he's gonna end up breaking her heart. and he's her first real boyfriend also. can anybody give me any advice to help my best friend. she was there for me when my ex was being an asshole to me %26amp; i wanna be there for her.Best friend's boyfriend is being a jerk to her...?
Well think about how she helped you, did it work? If it did, do the same for her. Most likely though, she's not going to believe anything she doesn't want to hear. If she wants to be with him she's going to be no matter what you say, and you getting in the middle of it is just going to hurt your friendship. I wish there was a different way, I've been on both sides of this situation and I don't believe anything you say will affect her decision about being with him. She just needs to realize on her own.Best friend's boyfriend is being a jerk to her...?
tell to drop him before he breaks her heart.

thats what you have to say. I just shortened it for you.
I would just talk to her and explain that he shouldnt treat her like that because its rude and obnocious. Just tell her that shes better then him and if he really liked her he would treat her with respect.
You can ';be there for Her';- by simply waiting for her to realize that her Boyfriend IS what you ';say';, and then helping her to ';pick up the pieces';- after she dumps Him. This is Something that SHE has to learn %26amp; do on her Own, while YOU ';stand-by'; %26amp; wait for the ';Inevitable';. Sometimes the ONLY ';Way'; we ';learn the truth';, is the HARD Way- by Ourselves... .. . :(
either you can be there for and tell her why this guy in bad or someway or some how show her what he does. I am not saying to stalk him but find someway to show what kind of guy he is.