Men cheat for other reasons, including the ones listed below: he doesn’t believe in monogamy because he thinks that all men cheat because he didn’t think you’d really care because he’s spoiled, selfish or inconsiderate and wants to have his own way because he wants to have his cake and eat it too The best thing you can do is educate yourself about infidelity because you can’t afford Keeping Your Marriage Strong to be the last one to know. “They’ve evolved the desire to be with different women,” he says. “Once we’ve seen a woman naked several times, it becomes commonplace. That doesn't mean it's good for you. Then I gave her my reason, my three magic words.