How should I deal with this so our friendship doesn't end?

Anonymous
My Best friend of 14 years starts dating this guy it's been almost a year... During the relationship her boyfriend has blocked her dozens of times when he gets mad at her. Broken up with her. Kicked her out of their apartment multiple times in the middle of the night. Suspiciously tried to get her friends number to Prank call her after he accused that friend of trying to sleep with him. Calls her names and accuses her of cheating. He also makes me feel uncomfortable by talking about my sex life and asking my best friend if my boobs are bigger have we seen each other naked etc. I would like to stay out of their relationship but she calls me and texts me all the time on how her boyfriend treats her and I've even had to help her move back to her parents but she keeps going back to him. I've told her and I've set up boundaries but it's like she gets mad at me and makes excuses for her boyfriend? How should I deal with this situation so our friendship doesn't end up as a loss?
How should I deal with this so our friendship doesn't end?
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