Hi Terry,
You're an amazing guy, and I know that I haven't been around much, but please know that I really admire you for being one of the friendliest guys I know.
I don't know what this situation is you've mentioned that's come up, and I'm not asking as I respect your privacy, but please know that I'd be happy to offer any support possible.
You mention that some may not miss you, well anyone that doesn't like you has got to have an intelligence quotient that would make a vegetable feel like Einstein. Your camaraderie and one-liners are the perfect ingredients for a great clan. Your not being around is going to be a huge loss for the clan, a phenomenal loss.
You've got one of those personalities that would shine in any room you would walk into, instantly likeable. You're accent is brilliant to listen to, it's a mix of John Wayne, Charlton Heston, Rambo, and Tom Hanks, all rolled into one. You've got it all.
Did I mention that you're a great guy?
Take care Mr. Terry, sir. You are very much liked, and in your absence will be very much missed.

Just be a nutter... life becomes much more exciting, and people won't expect anything more of you...