That's sounds really good Moffa
Things have changed a bit here. We have a first counselling session with a counsellor who specialises in ASD/NT relationships (she's recommended by the NAS). DH is doing lots of reading and is taking responsibility for his behaviours and still consistently trying hard. We've been able to have meaningful discussion about some historical instances and where we misunderstood, or being able to analyse his behaviour.
He's met with a few of his friends and been able to talk about it. One friend giving him tips that he might not have instinctively thought of. We had a date night last night, just watching a film- but a film I chose (first time in 12 years!) and it was really nice. And after work he listened to me talk about my day and asked questions and made comments that showed he was genuinely listening.
So actually I 'm feeling more hopeful. This doesn't feel the same as previous attempts to change behaviour, it is very different. He has also acknowledged that it might not work but whatever happens he wants us to be able to get on and co-parent the children.
There's still a big hill to climb.