How do you lose feelings for a girl?

Anonymous
My ex cheated on me but we are still friends with benefits. I still have feelings for her but I don't want to. The thing is that she dates other guys and then tells me about them thinking I don't have feelings for her anymore but I still get jealous. And when I tell her about the dates I go on with other girls she seems to get really jealous as well. We dated for almost 3 years and I know that I would have to disconnect myself from her to actually lose feelings for her but she won't let me. If I go a week without calling her its like she starts stalking me by looking for me at my school and repeatedly calling me. I even said we shouldnt have sex anymore because it makes me have more feelings for her but then I know she will start having sex with someone else and then I'll get even more jealous but I really, really don't want to. And its not like I can just go out and start having sex with some one else to get my mind of her because I know that wouldn't work and I am not ready for another real relationship. I don't want to have feelings for her anymore so how do I lose my feelings for her as quickly as possible without completely disconnecting myself from her and without getting another girlfriend?
How do you lose feelings for a girl?
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