Why do people resort to cheating instead of ending their relationship?

Clearly they don't care about their partner so why just not leave them and get with the other person? If there are kids involved I can still see why they stick around even though they still shouldn't cause the kids have to still suffer I know that very well cause my own parents have had a horrible marriage and the only reason they are still in it is because of us kids but we know how unhappy things our in our household it would have been better for my parents as well if they would have just gotten divorced.

Why do people resort to cheating instead of ending their relationship?
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