Final answer:
Dependency refers to an abuser making their significant other do things on their behalf, creating control, while co-dependency is when the significant other ties their sense of esteem to doing things for the abuser, perpetuating the cycle of abuse.
Step-by-step explanation:
The concepts of dependency and co-dependency are often discussed within the context of interpersonal relationships, particularly those affected by intimate partner violence (IPV) and abusive dynamics. Dependency in this context refers to a situation in which the abuser manipulates their significant other to perform tasks or make decisions for them. This creates a scenario where the abused person feels necessary but is simultaneously under the control of the abuser. Co-dependency, on the other hand, occurs when the significant other, often a victim of abuse, derives their sense of self-worth and esteem from their role in catering to the abuser's needs. This dynamic may lead the significant other to feel valued only when they are needed, thus reinforcing the abusive cycle.