Aspiring there's a part of you that does know the truth.
Oh I forgot to mention that my friend's narcissist is one of the most charming people you'd ever want to meet. He could sell ice to an eskimo.
Bottom line, Aspiring - you need to do what's right for you. Every situation is different. If you need to be with him to experience this for sure and finally put it to rest one way or another, so be it. But there will be a price to pay.