I feel bad for saying “I hate him”

I used to, back in the day when he made my life and the kids lives a living hell. It took many years of therapy, self help, support groups and countless hours of introspection to genuinely feel indifferent to him.
His girlfriend/partner was consulted bu one of my ex’s siblings regarding a will or any kind of End Of Life Directive, because he had mentioned a will to one of them several mo the back. The partner said she’d been urging him to come with her when she updated hers, on her dime even, and he kept saying he would but then kept putting it off. She finally went on her own with promises from him that he’d see the lawyer separately. Turns out he didn’t and there is no Will or directives of any kind
My hate for him was re-ignited by this thoughtless, selfish choice, by his utter disregard for how things would play out for his kids should something happen with his health. He’s overweight, heavy smoker since he was in his teens and he’s mid 70’s now, high BP, COPD issues, terrible diet and no regular doctor visits or supervision, so he for sure was a prime candidate for a catastrophic health event.
My kids don’t deserve this, don’t deserve to be struggling with their anguish over having to make decisions no kid should ever have to make for their parent simply because he didn’t make them in advance so that they didn’t have to.
So yeah, I hate him for that. And I also hate him for creating such a situation that I have de-volved in my own emotional healing and landed in a place where I hate him all over again.
I know that’s not rational. I know. I’m working on myself as I stand as a support for my kids. My therapist is on speed dial…literally.
This is just rough.