Why would a narc talk to you just to abuse you? I’ve blocked them now but I just want to know why?

My ex narc tried to talk to me recently and kept being nasty. Blaming me for everything, saying that I’m trying to do this and that and the next thing to him. He has not said one nice thing. I confronted him and he immediately got offended and told me to stop talking to him so I did. Yet he didn’t delete me off social media after this when he said he would? Why did he just come back to be nasty? He’s now blocked but just tryna get closure

Why would a narc talk to you just to abuse you? I’ve blocked them now but I just want to know why?
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