Metallic Thorn--codependency, like alcoholism, can be fatal if left untreated. It is not a healthy state of being like independent or interdependent. Interdependency is the healthy state we strive for, where we live and let live. We need no one to complete us. independent 1 plus 1 equals 2 interdependent 1 plus 1 equals 2+ codependency with addict- barely two halves hanging on to appear as one.