Among the core characteristics of codependency is an excessive reliance on other people for approval and a sense of identity and is not only found in romantic relationships or marriage. Enmeshment is a sign of codependency.  This is a behavioral condition in a relationship where one person enables another person’s addiction, poor mental health, immaturity, irresponsibility, or under-achievement. In enmeshed relationships the individuals have difficulty recognizing where one ends and the other begins.