ANSWER:
I think it depends on individual. Affairs can and will be complex and hurtful to people who's being cheated on. There are affairs that last years even months if the the married man is careful and smart. But there are also affair that only last months because it was discovered. It all depends.
Another answer:
Should? It should last less than 2 seconds, because one party is a scumbag and the other is being treated like dirt. As soon as the abused party gets tired of it, the affair will end.
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