"I'd say check out City Year. Its an Americorps program that is built on diverse groups of people. The whole idea is to put a team of people with all kinds of backgrounds in a under-performing school to be mentors, tutors, and role models…"
"Oh, and at 40, you still have the majority of your adult life left. There's no reason you can't make new friends (seriously, there's no reason to think that, out of 40 or more years you won't encounter and make new, deeper…"
"There's no need to cut your friendship with him since you enjoy his company. Just know that A), you can't trust him and B) he does not place as much importance on the friendship as you do.
To end the friendship would not benefit you, but…"