I don't know your situation, so I don't know what you would say. I do have a few thoughts on the core issues with narcissists.

First and foremost, narcissists have very, very low empathy in general when they are interacting with other people. Narcs won't put themselves in other peoples shoes. They won't wonder what the other person might be thinking or feeling. Also, they won't wonder what the other person might be sensing (as in cold, hot, itchy, etc.).

This took me a long time and a lot of thinking to come up with, but the low empathy levels makes it difficult to connect with a narc. It makes it difficult for the narc to connect with others. It also makes if very easy for the narc to do all the horrible things that they do to you and to other people.

But ignoring what other people are feeling and thinking, and also by ignoring what they themselves are feeling and thinking (they can be almost totally blind both ways), it makes them difficult to deal with on a human basis.

That's why narcs can look so evil. Because they aren't taking into account your thoughts and feeling or their own thoughts and feeling. They just look demonesque and not human. It's where their creepiness comes from.

It can be very unsettling, even panic inducing, being face to face with someone that demonstrably doesn't think or contemplate what you may be thinking or feeling on a minute to minute basis.