You are allowed to terminate your relationship with toxic family members. You are allowed to walk away from people who hurt you. You are allowed to be angry & selfish & unforgiving & don't owe anyone an explanation for taking care of you.
Do you know how sometimes you have a bad day, and it may cause you to be a bit short with your kid or partner? And then, later, you go to them and say: I am sorry I was short with you, I was just worried/tired/busy/other, … We all do that, right? Well, not the toxic person. They live in a blissful world where nothing is ever their responsibility. When bad things happen, it is because the world is against them! When they are raging abuse at you, it is because YOU made them angry.