It is very difficult to forgive someone who has knowingly or unknowingly hurt us. It will take much time to be in that place of compassion as we are working on forgiving that person step by step. But we will get there, eventually, toward peace and moving on to a better situation than ever before.
Meanwhile, we should refuse to be in a wallowing situation where we blame, be not functioning and productive, or be a difficult person to be with.
There's always good plan and hope for each of us who might be in pain and emotionally hurting.