The Psychology Behind Infidelity Infidelity often leaves a trail of hurt and mistrust, but understanding its psychological roots can shed light on why it happens. Here are three traits that are often linked to cheating behavior: Narcissism: A need for admiration and validation drives some to seek attention outside their relationship, prioritizing their desires over emotional connection. Low Self-Esteem: Insecurity can lead individuals to cheat for validation, despite the harm it causes. Fear of