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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.
The other person may not look needy, but something in us senses that they could be better with our help, and the dance begins.
For a codependent person stuck in a dysfunctional relationship, there are significant losses: sanity, worth, identity, choice, health, self-respect, and hopes and dreams.