A reader posted this question as to whether serial cheaters can change. In thinking about it I realized the answer is not a simple yes or no. Many factors enter into the prognosis for serial cheating such as the characteristics of the cheater, whether the cheating is part of an addiction, the motivation to cheat and the motivation to change.
Cheating in general is so common that it further complicates separating out what is serial cheating and what is just the normal state of affairs (as it were). The statistics I have seen are from the Journal of Marital and Family Therapy: