When people think of cheating, they usually imagine physical intimacy with someone outside the relationship. But infidelity is not always physical. Sometimes, a person remains faithful with their body while becoming emotionally or mentally attached to someone else. This type of betrayal is often called emotional cheating, and for many couples, it can be just as painful as physical infidelity. What Is Mental or Emotional Cheating? Mental cheating occurs when a person invests emotional energy, romantic thoughts, or intimate attention into someone outside their relationship in ways that should belong to their partner. There may be no kissing, no dates, and no physical contact. Yet a boundary has been crossed. The relationship may exist mainly through conversations, fantasies, secret messages, or emotional dependence. He Shared His Heart With Someone Else One of the clearest signs of emotional cheating is when a person begins sharing their deepest thoughts, struggles, and feelings with someone outside the relationship before sharing them with their partner. Emotional intimacy creates powerful bonds. When someone consistently turns to another person for comfort, validation, and connection, the relationship can begin to replace the emotional role of their partner. He Started Living in Fantasy Mental cheating often begins in the imagination.