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Everyone in this situation has to make their own decision. Women cheat too, by the way. All that's happened is we've discovered we are human. Yes, a marriage can survive an affair. That doesn't necessarily mean the partners are "just hanging in there." And the number of marriages where neither partner cheats, but are consistently satisfying through the duration of the marriage is probably very small. Marriage is ups and downs. Over 30-50 years, you can go through all kinds of cycles, from passion to indifference to companionship and many others, over the course of that time.