I talked with certified psychiatrist Dr. Susan Edelman, who specializes in women’s issues and relationships, to learn what’s going on in the mind of a serial cheater. She explained that this question, though a valid and rational reaction, is certainly a hard one to answer. There are a lot of factors that can contribute to someone’s infidelity.
To understand why people serially cheat, it’s important to take note of what our collective definition of cheating is. Dr. Edelman says, “It’s tricky, because what constitutes cheating? Sexting? Being secretly active on a dating site? Lap dances? Kissing?” There’s also a difference between emotional infidelity and sexual infidelity, though the latter is commonly taken as the blanket definition of cheating, says Edelman.