Also, how would you feel if you told your boyfriend you cheated, and he didn't care? Like, at all..
Most Helpful Guy
There is a difference between not caring if someone has sex outside of your relationship ( informed and agreed Open ) and if someone is cheating ( uninformed, unagreed presumed Closed ); it isn't the act of sex that makes for cheating but the lack of communication and honesty.
In that respect you're just asking how to have an open relationship and that comes with communication. If you're already in a closed relationship or a "non-participant" in an open relationship there really is no way to "not care" unless you disregard the person entirely.1
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