Few people - especially if they are really narcissistic - take kindly to being called narcissists.
Ignore them.
Be grateful they do not remember you
Johnny Depp Julia Roberts The twilight freaks
You keep reminding her that you are her child after all. Tell her that you are updated version of her!
Its not a big deal just keep it to yourself and you don't have to tell your BFF , but tell her boyfriend to layoff hes in a relationship
you dump them hard and relentlessly.
Just ask her if she might want to try it just to see what the big deal is! The worst she can do is say no. and if she is really your best friend then she wont judge you and if she does then screw her. That's not a friend worth keeping if she freaks out and acts all dramatic or something. I like kissing girls try it :)
You leave. There is NO dealing with this sort of person. And seek counseling for yourself ASAP.
Nothing
Practical jokes
You are saying narcissist ex. If he is your ex he is not cheating on you and why would you care if he is your ex. Forget about this and move on with your life. If you think that this is cheating on you - better think again and also know that this will go on and on.
Don't read into it. Just be her friend and if that's not enough tell her and just walk away. It sucks but we all have to learn to deal.