Welcome!
When I stopped going, I said I just didn't have anything religious to discuss but they were welcome for a coffee anytime. That worked quite well - they haven't been aggressivly barred from the premises which would piss them off, but they have no motivation to call either (and didn't).
Remember that they have a duty to call on every former JW every 12 months. They usually don't (thank goodness), but even if they do they usually don't expect anything out of it except a tick in the box by your name on their list.
(I used to make some of the calls on the more harmless x-JW's with an elder. It was usually just a mechanical duty, and so long as everyone played their role and maintained the status-quo, all was well. They asked us in for a cuppa, we either accept or decline on the basis of how comfortable the house looks or if we've got somthing better to be doing (ie: somthing even slacker). We chatter about the weather, offer the mags, invite them to the hall or for more discussions, have a second cookie and move on and forget we ever made the call. No-one enoyed it, but it was a break from the door-to-door stuff for us and showed the CO the Congo was doing the right thing)
Or it might just be a social catch-up? Who knows? Did you like the guy? If so - well, catch up with him or don't - your choice. If not, tell him to go hither or ignore him or meet him anyway- your choice.
Well, that's my thoughts anyhow...
Max