While looking for something else I stumbled across this post, which reminded me of an old roommate who had to go full no-contact with her abusive mother. It also reminded me of a recent girlfriend who had a narcissistic ex-boyfriend.
In both instances, I wasn't as supportive as I could have been, but at least the second time I got more of the gist of why "no contact means no contact."
Should I need to remind myself again, sticking this here to be left till called for.
