There is this woman. Isn't there always?

She was once my best friend or so I thought at the time. She manipulated me in various ways into being with her during my breakup with my previous ex. I have never been in love with her or even been attracted to her. She is attractive that's not the problem. I just never felt that attraction myself because she's not my type.

I've told her this but doesn't seem to make a difference. I don't even have sex with her still doesn't make a difference.

I can't leave because she has a large collection of blackmail on me. I'd lose my job my kids (wen my ex left she didn't want the kids either so I have them full custody ex doesn't even bother seeing them) and possibly even end up in prison.

So I need her to leave me. I need her to leave without being angry at me such that she destroys me. Ideally she leaves me for someone else but so far I haven't been able to get that to happen.

Currently I tell her I am asexual due to steroid use so I don't have to have sex with her. I tell her she needs to have sex and should have sex with other people. But she refuses to do it. She says oh what if I fall in love with one of them. She's also suspicious that its a ploy by me to get her to leave because she watched me use the exact same ploy with success with my ex.