He doesn’t like me, so why keep coming back?

We used to be friends with benefits but he ended things. 4 mons later he’s in a relationship (after telling me over a year that he has commitment issues) he recently matched me on a “catfish” profile. (He’s pretending that someone catfished him) why? He claims to have no interest in me outside of sex.. I accept that.. but why is he back? He won't stay away.
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Thank you so much! I really appreciate your honesty and you sharing your experience.
He doesn’t like me, so why keep coming back?
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