I like tattoos and chickens and maybe 3 people shirt

They can always spin their own justification for strange actions. I would avoid going into a lot of detail about the narcissism. It can make you appear pretty if they have not experienced gaslighting or emotional manipulation themselves. It could undermine your authenticity with your friends. These are mutual friends so they like your ex too. They will be prepared to see the good in him and no doubt he has his own line on what happened. It will carefully reflect badly on you of course because he won’t be to blame for anything. Your best approach might be to rise above it. Simply state that you’ve moved past it and you wish him well for example. Or that things just didn’t work out, but you don’t find it constructive to talk about the past and you’re focusing on your future. Something in your own words to express that you are positive and not bearing a grudge and that you don’t want to get involved in talking about sex relationships. Save that for your best friend or your close confidantes.