What happens when you hit man's insecurities?

My ex keeps adding me from fake Facebook accounts. I accepted the add from one account then talked to him for a few minutes to detect his persona. When I knew for sure it was him, I sent him a very insulting message that hit every single insecurity he has
He used to be very insecure and very narcissistic
I blocked him immediately after the message
But what would his reaction be that I outsmarted him? Is he gonna keep stalking and following my news?
What happens when you hit man's insecurities?
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