What is your definition of cheating?
Okay. Well in my opinion there's more than one type of cheater.
There could be a cheater like the cheater on a test.
The cheater on a test looks at you or another person's test and copies off of it. Nobody's done that to me so far, at least, not as far as I know.
There could also be cheater like the cheater on a relationship. The cheater on a relationship goes out with another person when they're already going out with you... Still hasn't happened to me yet, I haven't gone out with anybody... ever.
There could also be a cheater like the cheater on writing work. Also known as the Plagiarist. Yep, I've been used by a Plagiarist before. He so got me mad when he used me for his poem-plagiarizing game. So goes my answer to the "that saying 'I'm sorry' can't fix?" Writer's Block question.
There are tons of other types of cheaters as well, too many to name