i'd vote for going out with him again. it's not a marriage proposal, just a date. i am sort of against using research and other people to fill in the answers that could/should come from his own mouth. or at least, hold that information pretty loosely in your mind.
it sounds like you were pleased with at least part of the date, and enjoyed yourself enough that i think there's value in finding out more.
don't make assumptions about what he shared. instead, give him a chance to explain his circumstances and himself better, by asking him the questions you want to know about. sometimes people can get a diagnosis for something that they don't fulfill typical expectations of.
also, a LOT OF PEOPLE seem to think they need to lead with every bit of "bad news" they have, as if they want to make sure you know every possible perceived negative he can think of about himself. unfortunately, that can sort of scare people, but it's pretty common. he might be doing the same thing. in that case, he is giving you all this up front--and i would say you ought to stick around long enough to learn about the positive qualities and goodness there too.
also, i have very, very seldom been attracted to someone on the first date. give yourself a little more time to get to know him better before you decide how you feel about all the things he shared. ask questions that were raised on the first date, and also, he might be very different because he is more relaxed. the second date is where you might feel some chemistry and a better sense of the rapport you might have.
stop overthinking it. just go, and decide to enjoy yourself. have fun. : )
finally, i agree with SS' comment about being slow and careful. actually, i think that's good advice for anyone embarking on a dating/romantic prospect.
