NurseButtercup
I didn't know what to say or how to phrase it without sounding awkward. Even if he'd said he didn't feel the same that would have been better than nothing.
I'm not content just dating someone to keep them company in the absence of a real girlfriend; I need openness and honesty as a bare minimum. I think I've been a bit swayed by other people in real life telling me how much he likes me and also the hope that, after being single for so long, I might have actually met someone.
Gutterton
I hadn't thought about that 
I don't have any help. And my strategies for managing social situations are effective but don't extend to intimate relationships and I don't have strategies for reading situations as such. I've not had a relationship that lasted more than a few months because I always walk away as soon as they don't seem right to me. I'm trying to avoid doing that this time in case it's just me. Or because it's been suggested I don't give people enough of a chance.
But it's making me feel ill and sad.
I've never had a deep, emotionally intimate relationship. I've never been able to work out if it's me or them. Obviously it's me, but is it them too? Lots of people with autism manage to have relationships.
Seems that it might be you that is not emotionally available as you seem to want to bring this to a premature conclusion?
That's what worries me most.
I don't really want to end it and it would really upset me to do so but I know that, at the same time, the relief I would feel as a result is enticing.
And I don't really trust myself not to be so blunt as to just say "am I your girlfriend or just someone you are happy to have around in the absence of an girlfriend?" I have at least learnt to remember that other people can find that level of directness rude and difficult to respond to.