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Codependency is an adaptive coping mechanism used compulsively by those who seek to obtain a personal sense of worth and value through meeting the perceived needs of others.
Boundaries define and protect who we are, what we value, and what we are responsible for. They keep us safe, and we have the right to ensure our own well-being.
For a codependent person stuck in a dysfunctional relationship, there are significant losses: sanity, worth, identity, choice, health, self-respect, and hopes and dreams.