Sometimes, people develop a greater degree of emotional intimacy with other people than they do with their marriage partner. Although it is alright to be emotionally intimate with other people, if that intimacy is not shared with your relationship partner, it can result in some very bad things. It can result in one partner feeling used and taken advantage of, in exactly the same way that traditional marriage infidelity can. The psychology of infidelity is no simple thing, and the causes very. As a marriage counselor, I have seen it all. Often, marriage infidelity is simply the result of an inability to commit emotionally. Sometimes the unfaithful person is acting out because he or she simply has difficulty accepting how deep and personally fulfilling relationship has become.