@PuffinSock sorry I only mentioned this in one of my posts on the old thread, but his ex passed away so he wouldn't have been able to go back to her but I and one of my friends I spoke to a bit about it did think that perhaps he suddenly felt scared/almost guilty about dating someone else for the first time since then. Which I would of course understand completely if he told me! (Also this might be relevant but he's 23, I'm 26, I know that isn't a HUGE age gap and he is a grown adult etc but I suppose sometimes younger guys can struggle a bit with emotional chats... and it is quite a young age to have something so traumatic happen to you... well that would be traumatic at ANY age.) It's the way he hasn't been active on any other social media or anything that makes me think that he's not "just" ignoring me, possibly he's in a bad place mentally and just hasn't felt able to speak about it properly, I don't know. I know I hadn't spent THAT much time with him yet (although our last nine-hour-long date was pretty significant!) but the way he was as a person and the way he was with his other friends etc didn't make him seem like the kind of person who would be dishonest or just drop someone like this either. But I suppose I'll never know unless he contacts me 
I hope it goes as well as possible @herbsmokedchicken, I think you're definitely within your rights to let him know that he went about things the wrong way. It would definitely be a shock and present a lot of mixed feelings to suddenly have this "last chat" foisted upon you though when you had no idea it was happening. Thinking of you!