Infidelity is often referred to as cheating or having an affair while in a relationship. According to Psychology Today, different people have slightly different definitions as to what constitutes infidelity, but for most it refers to sexual or physical betrayal.
Another form of infidelity is emotional infidelity. This occurs when one partner becomes emotionally close to a person outside of the relationship and develops a secret or semi-secret friendship. Emotional infidelity may lead to a physical relationship in the future. Infidelity usually occurs when the needs of one person are not being met, which may mean a person will seek out attention from someone outside the relationship.