I'm going to block my ex-girlfriend from social media even though we have nothing against each other atm
Why would you block her?
I want to punish her for hurting me
I understand your point, but sometimes it's good to stay on friendly terms with exes. You should have a talk with her about her hurting you.
No, I don't want to talk to her anymore. I want her to be miserable and that is the only way.
I am sorry that you are still upset about your relationship ending. It is not good to hold onto anger. You liked her at one point in time and could still be friends.