How to politely tell a friend I don’t wanna hear about her ex anymore?

Anonymous
I’ve been friends with her for over 6 years, and her ex boyfriend broke up with her prior to our meeting. So more than 6 years ago. I’m not kidding you, but every time we speak she has to bring up her ex and she vents and rants about him. I’ve been there for 6 years to listen to her and give advice, but she NEVER listens! Then she’ll come back to me and complain.
She has currently has a boyfriend of 3 years and still she tries to contact her ex. All she gets is ignored messages and calls. He literally doesn’t want anything to do with her, and I don’t know when she’ll realise this.

I’m at my absolute limit right now and want to tell her that I’m fed up of hearing about him. Our friendship is one sided as I’m the only who who listens and she talks. Even if I try to speak about another topic she has a skill of linking it back to her ex. Not to mention she calls me anytime she wants, at 3-4am while I’m asleep! She says it’s an emergency but it isn’t! She wants to vent about her ex and make me investigate him. I need help please, cause I’m loosing my mind!

Thank you.
How to politely tell a friend I don’t wanna hear about her ex anymore?
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