At first I thought you guys had made a definite "be there at such and such a time and place", but I'm reading now that it was more casual than that.
I guess that for him, it was just a casual "maybe we'll meet up, maybe we wont" kind of thing in his mind.
Whereas for you guys, its a huge thing, because youre hoping it leads to date, and poly, and sex, etc. You guys were dealing with hyper emotions around this potential event, whereas for him it might just be casual thing, because he doesnt really know what you guys are up to yet.
Male M, struggling noob.