"Once a cheater, always a cheater" is often the response to an individual who can't seem to keep their hearts and parts in a monogamous relationship. But we beg to differ.
Rule No. 161 on "According To Him + Her" states that two people who meet while cheating with one another can have a healthy relationship. While some might argue that cheating is an ingrained behavior, it's important to understand that infidelity can be far more complex, going beyond shallow and physical needs.
In a March 2014 article for Psychology Today, Kelly Campbell, an Associate Professor of Psychology at California State University (San Bernardino), broke down the three biggest factors that lead to infidelity: individual reasons, relationship reasons and situational reasons.
Individual reasons are connected to gender (men are more likely to cheat due to high levels of testosterone), personality and religiosity/political orientation. Relationship reasons can play a huge part if one person is feeling unsatisfied or unfulfilled. And one can't forget situational reasons, such as where a person lives (urban vs. rural) or distance.
In the case of two cheaters getting together and having a healthy relationship, it's absolutely possible. While they might have met in a dishonest manner, there's nothing keeping them from having a happy ending-- if they're willing to put in the work to keep the romance alive.
Bottom line: if both parties are compatible and dedicated to seeing the relationship flourish, it won't matter what happened in their past.