Do narcissistic partners lack common sense?

My narcissistic ex boyfriend whom I've dumped 5 years ago texted me from another number. He requested a friendship, just greeted me as if nothing ever happened. I blocked him again.

He still owes me $2000 (I've already accepted I'm never getting my money back) and still had the audacity to think we can be friends. He scammed a couple others too. Do they really lack common sense? Requesting a friendship from the very person you played with, you're the most hated among her family and friends, you've been blocked before and even owe money to? Seriously?

Do narcissistic partners lack common sense?
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