Should I I enjoy watching my abusive ex's life fall apart?
That doesn't sound good. What do you gain by watching her life fall apart?
She's a bad person. Whenever I watch bad people's lives fall apart, I think to myself, "Aha! Serves you right!". So yes, I gain joy by the misfortune of others.
I can understand where you're coming from but focusing on someone else's life so much that you want to see them fail at it is just wrong. Instead of worrying about other people you should be focusing on yourself. Feeling good because of others misfortunes is a terrible mindset to have.
I can't help it. I think I will block all my ex updates to avoid seeing anything about her.
That would be a good idea if you cannot help yourself. It is awful to find joy in her pain and you should avoid those things that make you that kind of person.