Unfortunately, the chances of a narcissist changing their ways are almost 0% unless they are willing to admit their issue, and get intensive help. Not something most of them will do.
I agree with the others. You need to both find other jobs and just step away for your own sanity. I know it's not an easy thing to do, but that would be my ultimate goal if I were in your shoes.
Many, many hugs to you. It has to be very hard dealing with all of this.