He said he never felt that type of attraction before so I doubt that he is gay, since that would mean that he at least felt some type of attraction towards another person. But I read in a study once, that people who suffer from immense depression usually don’t feel any attraction to people, so he must have been really depressed and lonely without knowing it.
Holy shit. To a T! My mom died and it's been like this since then, i also have aspergers and do a lot of introspection. For me I'd say "meaninglessness" is the thing for me.
Something i think is weird though is that you said it's not a depression? I definitely feel a way that i can only describe as depressed all the time. But going back into meaninglessness, it's actually hard for me to be happy about things, i get excited for a second and then it's just like "but what's the point"?

All his life he hasn't experienced sexual attraction to the opposite gender?? How is that possible