This guys anxiety is general anxiety and not relationship based. Like he had the chance to take a really great trip, but backed out last minute because his anxiety got the best of him .
You might stay aware that anxiety this extreme might be social anxiety, or it MIGHT be OCD. People with OCD get very anxious. I'd be curious if the backing out at the last minute was because he was overwhelmed at the thought of the amount of socializing that would be required - or if he had OCD concerns like phobia of flying, germs, etc.
I'd also be interested in what kind of treatment (and how long) he has had. If this is a recent development and he's getting treatment, that's one thing. If it's a lifelong problem that has kept him from being a productive member of society that's a whole other ball of wax. Not saying that he couldn't be a lovely guy or that he doesn't deserve love - only that taking on someone with those challenges might not be right for YOU..
I don't have the ability or frankly the interest to dig into the why's of this but dang, all I see is a huge red flag. I mean, he sounds like a whole lot of fun - backing out last minute on a really great trip? Oh yeah, sign me up for some of that. I mean, it would be one thing if a true mental disorder would befall someone I'm already committed to and in love with. I would not abandoned them but as KML says, taking on someone with challenges like this... I mean, why? He's not yours to fix. I'd be really, really cautious.
I've said this before and it really seems to apply again here. The most common reason someone tries to set up friends, let alone set up a child with a friend is not based on common interests, on hobbies, on personalities, on potential compatibility, or often even on looks. The number one over-riding reason they try to set single people up is BECAUSE THEY ARE BOTH SINGLE! I have to wonder if that's the predominate reason here - he's single, she's single, let's set them up.
DonH Midwest Me 56 WAW-EXW 55 Met 11/95 / Married 5/00 Bomb 6/20/05 / She Filed on 6/2/06 / Divorced on 10/9/06 4 who'd qualify as GF since D & dated about 25 women since D