I find it really difficult to understand what is ASD behaviour and what is him just being disrespectful/selfish
That’s understandable, there’s a lot to learn about autism and it will be different slightly in each individual. In the early days of my relationship with now diagnosed DH, I didn’t know about autism so I really didn’t understand why he needed so much alone time, or even just quiet time. I was very social then and am quite a loud person, I sing around the house and talk constantly to the animals and things like that can be annoying for him. I took it way too personally in the early years and after having kids one was diagnosed, then he was and so much made sense after that. I’ve spent a lot of time learning about autism in general and then discussing with DH how it is for him. The diagnosis helped this a lot. I also started to look at his interests and what we might be able to share, for him quieter activities for the most part like gardening, art related things. He has very sensitive hearing. I know when we are gardening together, that he won’t enjoy it as much if I talk all the time. He knows despite us not conversing, that I don’t appreciate him putting headphones on in the garden when I’m there. So there’s a little compromising for both of us. He has also tried things I like, he even got way more into kayaking than I was! Things he may not have tried but did because I enjoyed it and we can do together, have turned out to be things he got really into as well. So it depends on the person and how they like things, for my DH it meant either quiet activities or being mindful he doesn’t like as much chat while doing things.
I don't want to be constantly asking him to do things as I would for one of my teenagers.
This stuck out to me because I totally understand that and get annoyed by it too. Even after 30 years, that frustrates the hell out of me. My DH has very poor executive function, I believe that’s particularly common. So as frustrating as it is to feel like a bit of a mum to him sometimes, for our life and partnership I have had to accept this is a skill I excel at and he just doesn’t possess much at all. For us to have a harmonious working household, it works best if I do give him lists, discuss the days plan or we have a big huge board in the kitchen floor to ceiling where everything is written down. Todays routine, weekly menu, shopping list, kids general week plan if it somehow involves us ( only 1 at home now ) our long term goals or projects are on it too and a budget. I do most of the writing down but my ND daughter here learnt all this as she was diagnosed young and loves lists and schedules and writing them for her Dad- she just goes a bit far sometimes and schedules every 15 minutes and he has to tick it off as he goes 😂 so we had to work out a compromise there! He absolutely loves this and feels much more relaxed if it’s all spelt out for him. He knows what needs doing of course, he just forgets a lot or focuses on the wrong thing etc For me, it means I don’t get cross if he forgets or get overwhelmed myself with having to monitor or make sure x,y,z is being done. What we have worked at is making it equal in our relationship by each doing what we are good at. My DH does a lot of the manual work, he makes most meals, he will do anything for us, and he takes care of areas like, the car, our current tenancy he manages things with LL… he is at the top of his field and has a good way of speaking to people in a kind of professional way, like landlords and schools.
I hope that offers a little help or suggestions. I would also encourage being crystal clear in what it is you need, if it’s within his capabilities, and particularly with the children, tell him clearly, more time is needed from you with them.