Is there such a thing as an affair-proof marriage? Is it possible to love more than one person at once? Why do people cheat? Can an affair ever help a marriage?Infidelity is the ultimate betrayal. But does it have to be? Relationship therapist Esther Perel examines why people cheat, and unpacks why affairs are so traumatic, because they threaten our emotional security. In infidelity, she sees something unexpected - an expression of longing and loss. A must-read for anyone who has ever cheated o ...