Betrayal (2012)

A young man goes to see a doctor for a random check-up. Although they don't seem to know each other, the doctor, a young woman, tells him that his wife is cheating on him with her husband. The man doesn't know whether to believe her at first and he is stuck between fear and paranoia. He decides not to confront his wife, and goes back to the doctor who, in order to make him believe, gives him a guided tour of the hotel where their partners are supposed to meet. Soon enough, the betrayed couple starts a relationship on its own, although it remains unclear whether they do this out of real love, revenge, or mutual sympathy for being in the same situation.