I have felt this way too, though not towards a T but towards a person or two who did and said things that were damaging. At least one was supposed to not act like a complete selfish asshole.

IME the best way to get back at anyone is to cut them out of your life and go on to live a good one. You can heal, with or without therapy. Our mind and our body are designed to heal.

I am sorry for what has happened to you that never should have.