Doesn't make you stupid or deluded at all, sponge - we've all been in that situation - or at least most of us have, where things have been going great, butterflies in the stomach, feeling like there's a real connection, and then they just disappear. It's not a sign of delusion. It's human nature to want the best from people.
Either they're sociopathic and extremely good at showing what you want to see, which is unlikely. Or there is mutual projection, as someone said earlier, which is just being human. we look for something great which suits us, we think we're finding it, and it goes wrong with no explanation.
I can understand wanting closure. I don't think doing it in a passive aggressive way is the best way, it's unlikely to make anyone feel better. I mailed Historian and asked for my own benefit if I'd done anything wrong specifically, and wish I hadn't. You could just send a text saying 'I had a lovely week, it was lovely spending time with you. I was hoping things would work out but obviously you have other things on your mind. hope your willy drops off Good luck. '
And you're unlikely to get a response from that, if he hasn't responded to your texts so far he's unlikely to respond to that. Some switch has gone off in his brain, for whatever reason, and he may feel guilty about telling you he doesn't want the third date, but he's not going to do it now.