Codependent behavior is, when two people rely on each other to give them something they can’t provide for themselves. In the case of addiction, the Person with SUD, s usually depends on the family member to provide financial and lifestyle support, because their addiction makes them unable to care for their own basic needs (job, food, shelter, etc.). They also are often dependent on family members to give them the love that they don’t feel for themselves, to continually prove to them that they are worthy of love, attention and resources.