My best friend recently got out of a long relationship and she has had a boy best friend as well who isn't a mutual friend of ours but right after her break up she hooked up with her boy best friend because she wanted some sort of breakup hook up. Her past relations haven't been great and she has never really been alone, she has always either dated someone or been at the talking stage with someone and I really don't think it's a healthy way to cope with anything because it just adds to the baggage she already has. She has hooked up with her best friend at least two or three times now and it has been frustrating for me to see her keep doing things that affect her mental health, I have already told her how I feel about her doing this since it's not a smart thing to do and is quite disappointing to be honest. I honestly don't know how to be there for her anymore since she treats my advice like it's nothing all the time and she knows that she's doing the wrong thing. How do I be there for her, or what do I do?