Why do women cheat in relationships?

A while back, I tackled the topic "why do women cheat?" I must admit that the response has been overwhelming, both from men and women sharing stories, on how they have been mistreated, betrayed, destroyed and devastated as a result of the cheating spouse. Several men were devastated about their cheating wives and have been unable to heal from the pain. Nothing has the potential to devastate a relationship than cheating. It erodes the relationship of its basic fundamentals, the foundation of trust and fidelity. What happens when they both covenanted to love, honor and be faithful to one another for as long as they both shall live?