My friend and his girlfriend both exhibit questionable behavior. I'm going to call him out for being a narc and her for not getting the mental help she needs.
Where are your friend and his girlfriend's bad behaviour coming from?
They have this power to ruin people's happiness. In general, their behavior is disgusting.
Even though your friend and his girlfriend have bad behaviours, you shouldn't be inconsiderate by trying to tell them what to do. Walk away from this relationship and move on with your life.
I don't have time for my sob story. I need to be a martyr to these assholes.
You may not like what they are doing, but it is rude to tell them what to do. You can suggest they get some help and tell them it is in your best interest not to hang out while they act like this.