Please help me clear my confusion?

I am in a long time relationship, but I recently started fucking someone else and it was so fun and satisfying until i lost appetite for fucking my man, am now trying to stop mysef from fucking the other guy so i can get back to wanting my man… will i get the feelings for my man back?
I also miss the other guy, but he knew i am in a relationship and he come for sex when i denied him he started acting cold but i really want to mend my relationship with my man… if i force myself to have sex with him will i still feel the same like i dd the first times? Can i completely forget the side and concentrate on the main man? Has it ever happened to you? What did you do?
Please help me clear my confusion?
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