And even worse: sometimes things end because of cheating.
So, we want to know: if one of your parents cheated, how did it impact your life?
Maybe you stumbled across your mom's secret online dating profile.
Or perhaps you ran into your dad while he was out on a date he shouldn't have been on.
However it happened and whether or not your parents stayed together, we want to hear your story. Tell us about your experience in the comments, and you could be featured in an upcoming BuzzFeed Community post!