Coly, so great to hear an update from you. But why does that have to be the end and why does there have to be an announcement even if it were? What would it change? I would try to be light and breezy about the stuff and leave the door open in case he ever wants to contact you. Sounds like you could invite him over for a cuppa (do you guys say that?) at some point in the future if you wanted and he would come right over.
Do you really think he is going to come back next weekend if you don't chase him to do so? This guy hasn't taken stuff from his car from February.
I think a lot of your sadness over this situation is that you have a habit, as I used to, of projecting today over the rest of your lives. In other words, because he is this way now, he will always be this way. Or because you feel this way now, you always will. I know 2 years is a long time, but in MLC world it is nothing.
I think trying to make it final like that would feel like pressure to him and it would commit you to something you might want to go back on at some point in the future.
I think it is a positive sign that he didn't know what it was and still came. You guys have always been so polite with one-another. That is really quite lovely.