The cultural expectation should be if there's infidelity, the marriage is more important than fidelity.
Dan SavageStraight couples don't have to be monogamous to be married or married to be monogamous. Monogamy no more defines marriage than the presence of children does. Monogamy isn't compulsory and its absence doesn't invalidate a marriage.
Dan SavageI think the best thing for you to do is just live your life. Live a life that's worth living, one where you do what you want to do, pursue your passions. That way, if you meet someone, they'll be joining a life that's already really good.
Dan Savage