How to deal with a friend who doesn't take your advice but keeps complaining about their problem?

I have this friend, let's call her b, b and I met when I was 14 and she was pretty young i think 11, I see her a little sister and i always try to protect her cuz she is the type of person to not even block people that harass her in dms. When she was 14 she started dating this 16 year old and while it's not a big age gap i still thought it was a little weird and told her so and I told her the relationship wasn't going to end well and turns out I was right, she and her gf broke up but still remained friends the problem they have the most toxic codependent relationship on this Earth, they fight block each other make posts about each other on Instagram then make up and the circle restarts, problem is when they block each other my friend doesn't shut tf about this girl every single conversation is about her and what they talked about and what they did together. I told my friend she needs some distance especially after the girl got jealous and mad because me and my friend started matching on Instagram and blocked my friend, I told her she needs to tell her friends her jealousy issues are a problem and that she can't block her anytime she gets slightly mad and she is obviously not listening to me. Another issue is my friend is in love with the idea of being in a relationship and has the lowest self esteem known to man kind and I keep telling her she needs to work on self love and trying to stay single cuz she very obviously has a problem of becoming dependent on whoever she dates, after breaking up with the girl she started dating a guy and literally couldn't go a day without fight bringing me in to solve the issue between the two and making up. I keep giving her solutions for her problems but she never takes them and then complains to me about the issues that could have been resolved if she just listened to my advice and tbh I'm starting to get mad but at the same time i really pity her and I don't know what's the best way to deal with it. Atp I told her to get back with the girl so she stops talking to me about her because every single convo we have is about her, I DON'T KNOW THIS GIRL and I really don't care about her and I'm tired of listening to the same issues over and over and over again