Cheating, infidelity, adultery, cheating, skating crooked, a slip-up ... Whatever you call it, it is a loaded subject to talk about. In the four-part series Ontrouw, Eva De Roo listens to courageous testimonies from people who have come into contact with cheating in a relationship. Together with them, she hopes that this can be discussed more in the future. At what point does cheating really mean cheating? Can a couple survive cheating? Why do so many people cheat and is a monogamous relationship doomed to fail? Eva is confronted with the major impact of infidelity, but at the same time looks for nuances in the many stories surrounding cheating. In her search, she receives help from relationship therapist Katrien Koolen.