You may catch a narcissist in a falsehood. But they always seem to have an answer. They’ll twist the facts until the facts fit their narrative. Then they’ll claim the facts prove they they were right all along.
Relationships with any narcissist suffer because it’s always about them. They’re so wrapped up in themselves and their desires that there’s no room to consider others. And because they can’t really concern themselves with you or your needs, intimacy suffers.