Once a Cheater, Always a Cheater: Is It True?

"Thus, not all unfaithful individuals have personality disorders or mental issues. Sometimes, infidelity must be specifically done with a particular partner," she added.

Of course, there are many other reasons why someone may engage in repeated deception. But the good news is that it can be addressed and cheaters can reform.

"There is no quick fix. You have to work on your identity, self-esteem. It's a very long journey that involves exploring and reconfiguring the relationship between oneself and others. But yes, it is possible to become better and to be better for others," Barcenas said.