
Codependency is sometimes referred to as relationship addiction. It may not be the easiest to define so here are three definitions, which are a mix and match from what I found online:
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 addiction.
In broader terms, codependency is also defined as “an emotional, psychological, and behavioral condition that develops as a result of an individual’s prolonged exposure to, and practice of, a set of oppressive rules.”