Cheating is about having a physical and/or emotional relation outside of your current commitment (sometimes even marriages)..
I know many, with this low self esteem.
But these kind of people are never satisfied with what they have. Some cheat one partner and keep a new one, and then they desire to have the previous relation too. Such sick minds..
People!!! I don't care who you are, but i wont respect you if you cheat on your partner!!!
Have some respect.
Make your partner proud of yourselves, this is what would matter the most... dont be a filthy bag of crap.