Some of what you quote here from him is ultra clear and fits the situation. He has done as he said. He didn't say it would be because you pushed, but I also think you are maybe missing the point that achieving the level of closeness you and he did was eventually out of his comfort zone. Not because you pushed, but because he doesn't usually get that far and his own insecurities made him shut down.
(Or, he could be a bit like
@SusanLR , but he seems to say differently. In terms of his hopes I mean.)
And/or, could it be he actually felt frustrated that there was nowhere your mutual friendship could go, easily, plus lacked the confidence or ability to articulate that? Like, Timo_WA is so cool, but I can't take it further and there's no future here...?
But, another issue I think a lot of people aren't aware of, is that autistic people are similarly affected by the much researched processes involved in human developmental attachments, where we all, neurotypical or neurodiverse have a level of developing relational security we can see as on an attachment quadrant.
So, like there's notionally a field we are all in at any one time and likely it's also variable in relation to specific others we are relating with, where we operate from a secure to insecure stance, which is also characterised by what our strategies have been, or had to be, in relating to others from earliest childhood. You can find a diagram and lots of information on this by googling attachment styles, though quality of information varies.
This attachment style we develop can be further developed towards more secure relating at later points, given the right circumstances. It is often said that autism is neurological, not a mental health condition, and as such is not changeable. However this is also true of neurotypicality. In neither case does it mean the person can't change significant aspects of themselves through developmental life experiences, educational personal development, or therapy, for example.
So, our backgrounds and parenting will be formative for us, in many ways and certainly in terms of how far we feel confident in making attachments. We can all progress towards greater security in relating. It probably goes without saying that the more insecure we are, the less easy it is to see that that could be the case for us. This is where sustained supportive relating from someone and perhaps therapeutic support can be helpful.
There could be more you may want to look into about attachment security and relating, to further extend your ability to be a secure base for someone, and understand all the varied factors involved.