> they keep digging up the past and weaponizing your own failures against you in everyday fucking conversation.
I know that. You have no idea how much your post hits home. This kind of behaviour is exactly what I try not to replicate, because it is the best way to dig one's own grave. There is nothing good which can come out of it.
I think you have an issue with the word "forgiveness", and maybe it is not the right word. What I understand from its use in the article is being able to let go the hatred (way stronger than anger), and being able to focus on yourself in order to improve your well-being and to bring positivity into your present and future life.