Why do guys think you will accept them back?

This guy acts like a child throws a temper tantrum over plenty of things including accusing me of cheating. He used to be a roommate and was creepy from the start always standing over me and wouldn't let me eat in peace then he would comment on the clothing I had on making creepy comments. The owner of the house did nothing even though he had cameras he let this guy bother me. Fast forward I ridiculously accepted the guy when his friend asked for my number. This guy turned into a total nightmare including not only screaming and crying accusing me of cheating but also crying like an actual baby because I didn't want to do an l s3 x. He would go back and forth saying "I can wait till marriage." then wake up saying "I don't think this marriage thing will work if can't make love to my girl." I suspected he was using me after a while. Then the couple times I went to see him he would look at every other girl passing by and he had a habit of flirting. Next thing I know he kept texting "can we just be friends." then he said "I generally prefer white girls." Keep in mind he doesn't know how to drive and can't get a job because he is disabled. He kept calling and texting because I was sad over the childish breakup yet when dating him he didn't care that he hurt me or r ped me and when I was crying. It was no contact for like 4 months then he contacted me in February by that time I ain't even want him back. So it's another no contact until this month at this point I just changed all my info because I'm fed up and I deserve better in honesty and truth I don't find him attractive just like he wanted "wh te girls." I find guys of other races very attractive. It's funny Everytime he contacts he only texts which makes me think he is trying to keep me as a side chick. He never calls. Forgive my grammar English is hard.

Why do guys think you will accept them back?
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