Have you ever mentally cheated on your fiance but not actually willing to act on it?

So you see a hot boy or girl about 18-20 or your age range whatever age you like to date. But the thing is your engaged to another person and you get these bad thoughts about the one your fantasizing about. Then you try so hard for your fiance not to find out but they find out and leave you...

Have you ever mentally cheated on your fiance but not actually willing to act on it?
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