I don't know, exactly. But as a species, I think we are not supposed to just stay with one partner for the rest of our lives. Outside of that, you can chalk it up to people just being immature. Why? Because a relationship requires a commitment, if you can't end that commitment by being upfront with the issues, you are immature if you think getting caught cheating is the way to do so. A lack of morals and wisdom is something commonly found in cheaters, whether they admit it or not.

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