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We don't have to fix, rescue, or control others nor should we allow them to control us. We're free to care for ourselves and seek change in our own lives.
“Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things.” Philippians 4:8 ESV
For a codependent person stuck in a dysfunctional relationship, there are significant losses: sanity, worth, identity, choice, health, self-respect, and hopes and dreams.