...they didn't need to do it any more and they just wanted to "get along with the rest of their lives." Shortly afterward , they moved away & I've never seen them since.
I saw this happen over the years when I was active. And when we decided to get on with our own lives, we modeled our exit after some of the refugees we'd seen take a hike.
Suggest you think of some subtle way to get some information into his hands; find someone you can trust and provide the guy's email and send him a few good links. Or mail him a copy of C of C anonymously. It will do him good to know there are lots of others like him out there. That's what impressed me when I first discovered this forum.
But be selective. There's some off-putting whack-job stuff on this site these days so don't send him the forum addy just yet, but send him some carefully selected samples.