How do you all do it? Maintain and not let it overcome you?

I have to pay someone that said she didnt need me.

I never want to see her again nor hear her voice or feel her gaze.

Together for 21 years Married for 19 Separated for 3 years due to escalating violence on her part. Kids are 18+

She gets the house that i have to pay off.

Do i truly hate her or will that pass?