Excuse for my English, its not my first language.

I (16F) have been friends with this girl Mary (16F) for 4 years. Last 3 years she had a problem with eating disored and self image. She was always seeking for male validation bc her father is working literally 24/7 and he is at home just on the holydays. She had approximately 25 casual relationships since she 12, and she was never single. Last summer she met this guy (19M) and they got together, he was kind for first 2 weeks and then he completely changed. He became controling and he was always insulting her and telling her that she is a whore and that she is fat which triggered her eating disored that had calmed down for past few months. He was basically forcing her to have unprotected sex with him which made her have pregnancy scare. He wasnt letting her hang out with her brother and his friends bc he was so jealous and controling. He was a mad at her that he wasnt her first, and he didnt believe her that she was raped one month before they got together. She never said anything to him about that and she just stayed with him knowing that he is a piece of trash. Beginning of December she luckily broke up with him but they got togher again few days later. He wasnt letting her hang out with me and she needed to lie to him.He got mad cus she went on the birthday party of our friend and he didnt let her drink.on the 31st December she finally broke up with him and stopped talking to him and we both were so happy. But on the begging of February she started hanging out with him and giving him cigarettes literally everyday, i was so against it cus i know that he just wants to use her for her body and she is too stupid to see it. I love her so much but this is going on my nerves. Today she told me that they got together. Idk what to say or what to do cus i know she is gonna come back to me in 2 days and cry bc of what he said. I was always talking to her about him and supporting her, everyone was telling her that she needs to break up with him, but she didnt listen knowing that he is a jerk. Idk whats wrong with her and i dont want to listen to her crying bc i tried to help her all these years for all the problems she has been through but it just feels like she doesnt want any help. I know she is not forced to be with him or anyhting like that, she wants that.Am i the asshole?