How do I get rid of my boyfriend's ex-girlfriend?

Anonymous
I've been dating my boyfriend for three months. And since the beginning, his ex-girlfriend has been a HUGE problem. She texts/snapchats/calls/messages him constantly and she has made multiple efforts to contact me and lie about her sleeping with him since he and I had began dating. He and his ex dated off-and-on for 13 months, and he told me that every time he tried to break things off with her, she'd hurt herself or threaten to hurt herself. He feels that if he starts ignoring her while he's with me, she'll do something to hurt herself and it will all be his fault. Of course I understand his situation, but she refuses to get help and he doesn't make a harder effort to get her help. I want to be with him, granted our relationship is not perfect and he and I are pretty different people, but I think that we have a relationship that is worth the fight... only I'd rather not have to compete with his ex-girlfriend. There have been two times where I found out that she had been up to see him: the first incident was when they were in his apartment with his bedroom door locked, netlfix volume blaring. I beat on the door demanding him to get his cheating butt out of there, but when he came out he swore up and down that he hadn't cheated on me. But she was still in his bed, mind you. The second instance was that she called him a few nights after the situation above saying that something serious happened and she ended up staying the night at his apartment... in his bed, sleeping right next to him... He told me yet again that they didn't have sex and there was no infidelity going on. I tried breaking up with him last night, after explaining to him that I won't be caught up in this with his ex-girlfriend... but he started crying and holding me tighter. He never cries, he's a pretty rock-solid kind of guy... I ended up not breaking up with him because he said that he still wanted to be with me in this relationship... But he won't get rid of her... What do I do?
Updates
+1 y
Part of me wants to anonymously tell her mom what's going on (my uncle and my boyfriend's ex-girlfriend's mom know each other). She needs psychiatric and medical help. My boyfriend told me that if he tries to drop her, it's either Vyvance or razor blades... I don't want her to hurt herself, but she needs help!!
How do I get rid of my boyfriend's ex-girlfriend?
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