CODEPENDENCY is defined as a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (typically narcissism or drug addiction); and in broader terms, it refers to the dependence on the needs of, or control of, another.
This is key in codependent relationships. It is the disease of idolatry and harm or excessive love. Tough love is learning to stop being a part of the disease of addiction, so that the addict can choose to get well or not. It is a radical way of dealing with enabling behavior.