If They Cheated Once, Will They Cheat Again? A yet-to-be-published study by Denver University grad student Kayla Knapp looked at the relationships of 484 unmarried 18-35 year olds and found that people who had cheated on a partner in the past were 3 New research confirms everything your mom told you about “once a cheater.… Continue reading If They Cheated Once, Will They Cheat Again?