My best friend is in a really bad relationship

With a boy who hates me and won't even "allow" her to hang out with me.
She's never been in a real relationship, and I really don't want to mess things up, but I always speak my mind and tell him how I feel about him. And how I hate how bad he is to her. So he hates me for it, and I'm not trying to impress him or anything so I really don't care. I hate him too.

But, her boyfriend is even cheating on her, and she knows that he is & won't say anything cause she's afraid he'll break up with her.

& she'll do anything he wants just to make him like her. :|
Sex, steal stuff . Anything. Literally.

It's reallly stupid, and everyone knows she deserves better. And I don't want her to get hurt.. Cause I know she will. He's a total jerk.

Should I just sit back & let her get hurt, causee I've tried talking to her about it and she won't listen to me & let it be kind of a "well, I told ya so" moment?

Or.

Keep trying?

pleas try and tell her but if she dont listen to you tell her that your always here for her but do not say if he breaks you dont come crying back to me as she will stay with him to pi** you off sorry im not good help but wish you all the best but never give up as she will thank you

You need to sit down and have a talk with her - tell her exactly what you wrote here. If she gets mad then oh well, she'll have to deal with it. She probley doesn't even realize it, someone has to tell her and it really should be you. I know you said you have tried, but keep trying. If she doesn't want to listen then its her problem, its her that will get hurt. And if he does hurt her don't be all "I told yah so" to her because it'll make her feel worse, just be there for her.

Seems like she really loves that guy uh.

Well, its her decision. At least you've tried right? Even if she got hurts, what can we do? We cant do anything because its her choices.

Im glad that she has such a good friend like you. ^^

Maybe you should try one more time. Telling her about it. No matter what, she will still get hurts someday. I guess even when you tell her about your feelings, she will get hurts.. But she may ignore it as she loves that guy so much.

Just make sure you stay beside her to cheer her up whenever you need to.

I hope I did helped. =))