Forgiveness isn't about them owning up to their mistakes. It's about you releasing the hold their mistakes have on your heart.
if you forgive other people when they sin against you, your heavenly Father will also forgive you. - Matthew 6:14
"Love your enemies, do good to them, and lend to them without expecting to get anything back." - Luke 6:35
"God, who reconciled us to himself through Christ and gave us the ministry of reconciliation." - 2 Corinthians 5:18
