what makes men or women cheat their spouses but not leave them?

in my case i hope he is not cheating on me but if he does why would he stay with me?are love and sex separate for men or it’s just more easier to leave things as is for the sake of the child?we have sex 2 times a week average and married only for a year,i’m starting to beleive marriage is a sex killer…..what do you think?

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