Why did my cheating narcissist ex block me?

My ex he was a narcissist always taking everything away from me, leaving me with nothing even my last money. When I caught him cheating and asked him why he couldn't break up like a decent person if he wanted be with another woman he said why should I break up with you? You are my life. I blocked him three days ago on Telegram and yesterday I opened Telegram saw he changed his name and blocked me too why did he do that? I mean I already blocked him so why he block me suddenly 3 days later?

Why did my cheating narcissist ex block me?
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