So depending on the circumstance, relationship “boundaries” and what constitutes “cheating” have never been fully agreed to or even discussed constitutes a real problem. People assume their partner knows what they consider to be “cheating” but sometimes they don't. This is a discussion every couple should have early on. If you have different definitions of cheating, you could be headed to trouble. In these circumstances, the probably-cheating spouse will be very defensive and not agree with you that they cheated. And therefore, won't show remorse. I think this is not the most common circumstance.

2. The Cheating Spouse is engaged in an “exit affair.” They used it to get out of their marriage.