There has been a significant amount documented about co-dependency. It is the loss of self. A person losses their inner self and develops a false self. They require happiness to come from outside of them. There is a need for others to make a co-dependent happy and they require others to self validate their worth. It has been said that co-dependency is rooted in internalized shame. Shame can be healthy or toxic. We are all co-dependent on each other to some extent, however when we cross the line, and feel that we are more than human or less than human, that is when co-dependency becomes a problem.