It might be possible that a man falls madly in love with a different woman while he is still married to his wife. Such cases are rare and only happen when there is marital discord or no more pleasure in the bedroom. He might want temporary relief from his marital problems and get deeply involved with another woman. But it is usually that a married man is not happy with just one person. He needs someone else other than his wife to satisfy his needs. He cheats on his happy marriage because he wants more!