Forgiveness means understanding and letting go. It does not mean giving second chances, nor does it mean making excuses for bad behaviour. You can forgive someone and walk away at the same time.

Forgiving involves understanding, either understanding their perspective and why they did what they did, or understanding the limits of your current understanding their perspective and circumstance.

Forgive them, for they know not what they do.

For example one might forgive their father for beating them as a child, due to the realization of how horrible the father's own childhood was. This breaks the cycle, and creates space for better in the future... without requiring the father be invited to Thanksgiving dinner this year.

Forgiveness is about releasing your anger, animosity, and beliefs about what should happen to them for what they did. Likely what should happen to them isn't your business... Let go, let God, and focus on enjoying your life.