Is it really that hard to believe you can split from someone who's been around you for a long time and not be consumed by negative feelings? Or did nobody just ever consider that the constant negativity and guilt tripping and bullying and hypertension was why someone left to begin with and they're much happier without all that shit in their life? This ain't a Hallmark Channel movie, go find your self-serving vicarious happy ending somewhere else.
Besides, why forgive irredeemable people when you can cast them out of your life and then forget about them? Much better option.