He cheated and still wants to be friends with the girl, how do I get her to back off?

Anonymous
My boyfriend cheated on me with a girl and he refuses to end his friendship with her. I have asked him to at least stop having daily conversations with her if he can't stop being friends. She sends him messages saying "I had a dream about you last night :/" and gives him updates as to what she is doing throughout the day. I just want it to stop, because it's very hurtful to me. In the end, if he chose me, shouldn't he stop hanging out with her and messaging her all of the time? What should I do to get this girl to back off?
He cheated and still wants to be friends with the girl, how do I get her to back off?
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