Scripture
2 Peter 2:19 (New International Version)
People are slaves to whatever has mastered them.
Psalm 146:7 (New International Version)
The Lord sets prisoners free.
Consider
If I find that I cannot get past a hurtful event, or if forgiving the person who offended me seems impossible, then I have made myself a prisoner of that relationship disappointment.
Note the wording: I have not made myself a prisoner of the person but of the relationship disappointment. My offender may have no wish to exert power over me or to see me suffer.