Advice Needed 👀 (am I being a bad friend?)

I’m convinced my friend is in an emotionally abusive relationship. He’s controlling, constantly accuses her of cheating, checks in with her all the time, goes on her phone without her permission to read private messages (including hers and mine), demands that she “unfriends/unfollows” people and always makes himself the victim by using the excuse that he has trust issues... oh and he’s recently gotten released from jail. Despite all these things, my friend is convinced that he loves her and that she loves him. 🤦🏻‍♀️

Lately she keeps asking me for advice and venting about how pissed she gets with him. I’ve gently given her my advice, which is that she could do better, but she doesn’t listen. She just keeps calling me, sometimes every day, to tell me about all this stuff. I want to be there for her but I just can’t take all the drama anymore. Am I being a selfish friend because I’m having a hard time listening to her complaining about the same thing over and over? 🤷🏻‍♀️