Living with narcissist

I am a 60 year old male who just in the last few years came to realize that my wife of 25 years is a narcissist.
She is medicated, and it helps, but sometimes she slips back into narcissism, particularly when it comes to her male "friends."
I am trying to resign myself to the situation as I have grandchildren whom I love very much and do not want to jeopardize my relationship with them.
However, I am having trouble accepting the fact that this is the way my life is going to be and that she will not change. She is going away this weekend with "friends" and I'm afraid it will be a very tough weekend for me.
I would like some advice on how to improve my outlook while living in this relationship. Please don't suggest that I leave her because I am not going to do that. I want help with acceptance.

Thanks!

Hey Fatpaw,

I think it's fine if your goal here is to adjust versus the leaving option.

In that case there needs to be a list of positives, reasons you want to keep this relationship. What comes to mind as positives?