I just try to be strategic, and approach it as a strategy.

There are certain things I won't forgive, because of my own values.

There are certain things I will forgive, if the person is remorseful.

There are certain things I can just let go of, because they are more like accidents or misunderstandings than malice.

I think of these things as a type a boundaries.

Then I try to just sit back and let people teach me about themselves. If they teach me that they are malicious, manipulative, cannot be trusted, etc, then it is simply strategic of me to not have them in my life.

If someone teaches me that even though they are human and make mistakes, that they are generally good, then they are worth letting things slide for on occasion.