My guy friend and I had a touch and go beginning. I was the one to initiate it. By initiate I mean I told him I had "more than platonic feelings towards him". I was in a desperately terrible long term relationship at the time, complete with multiple children. I was very ill and in chronic pain caused by the stress and desperate unhappiness of the relationship I was stuck in.
We did step over the line, physically, when I told him how I felt about him, I was very attracted to him and that proved irresistible at first. We liked talking to each other so friendship was effortless, however, he had just got custody of his two son's and he quickly got overwhelmed and told me he didn't want a relationship, but he stated that he'd told me he was my friend and he chose to commit to the friendship. By this stage I had exited my long term relationship, that happened straight after the "physicality", I am an honest autist.
I moved to the next town over and due to our son's being best friends, we did maintain contact.
At all times I respected his boundaries, and there were plenty of times I just had to be content with friendship, as we are both autistic and genuine friends have always been few and far between, as such, we both put a very high value on friendship.
After a few years of living separately and dating a bit, as well as both seeing other people (yes, our relationship survived him briefly getting back with his abusive ex and me "playing the field") we decided to put the friendship to the test and move in together.
We have separate bedrooms and I think our living situation works because of being able to give each other the space us autistic people need (in general, but also remember "If you've met one autistic person, you've met one autistic person").
My guy friend pushed me away at the time I wanted to start a relationship, saying "You don't want me, I'm damaged goods". A lot of us autists have low self esteem and shame issues which make us think we are not "a good catch". Often, we have been subject to a lot of bullying, exploitation and not living up to what seems to constitute "success" so we can push people away because our image of ourselves doesn't allow us to feel desirable. The cognitive dissonance if this means accepting that someone wants to be with us, just as we are, doesn't really compute very easily.
I had to be consistent and also respect his need for space and less complications. I had to let go so many times. But because my feelings were true, over time, I did convince him that I was for real and I stepped in to help him, as a friend,
I did persist, though, when, at first, he pushed me away. Luckily our son's being friends gave me an in. He had been very, very, hurt, in extremely abusive ways, in previous relationships and he was quite petrified, for good reason. He is a courageous man though, or we never would've had a chance. I'm also a go-getter woman, who has enough wisdom to know when to step back and allow things and when to "speak my truth" and persist when my heart knows what it wants.
He told me "Go and live your life" early on, so I did, but, I also let him know that it was him I wanted to be with. I "played the field" to distract me, at that stage, because I was so heartbroken, but, my heart wasn't into it. It was kind of stupid, that I did that, it didn't really benefit me, it actually made me realize that casual dalliances are not at all fulfilling for me, but, I guess, they might've helped me feel a little more desirable (refer to above, when I said autists having self esteem issues).
Like you, at this stage (I am 51) I would probably just be content to remain unattached and avoid dating, if we went our separate ways.