I am struggling to see if anywhere in your posts if he has always been passive even in the early days of your relationship (apologies if I have missed it) Or his own upbringing and family dynamic ? As that might give some insight.
It is difficult to see how to repair such a deep issue that clearly has a lot of emotion involved.
When you deal with someone who for whatever reason doesn’t carry any of them mental load, organising etc and actually physical carrying it can be exhausting for the other persons. The crux of it is finding out why they don’t.
I have an adult Step son. I came into his life late teens. He was clearly neurodiverse but refused to discuss it - which I respected. He was living independently from his dad (has degree and full time job etc) but his dad was going round daily and cooking for him, organising him, cleaning for him etc it was bloody exhausting. DH didn’t know if he couldn’t do it, didn’t want to do it, was too lazy to do it, or too lazy etc
Expectations were laid deep down and entrenched. Eg DH and me did all the organising eg we told him what night we were going to x place to eat, booked it, picked him up, paid for it listened to his conversation for 2 hours, paid and gave him a lift home. If we didn’t organise it AND pay he didn’t come.
It has been a long process over the last decade to move him out of this. Due to something that happened externally he agreed to get a diagnosis and was diagnosed with autism which was clear. Various people say people with autism can’t be changed. Speaking as someone who is myself autistic we had to find out what was the autism and what was ingrained routine and what was laziness.
DH had organised all trips out at this point for over 20 years. Organisation all of his cleaning (let’s face it no one likes this), he had no social life, no hobbies or interests or social skill except trains - at which he talks at your at length.
We started in a loving and supportive way eg we talked about money and finances and he needing to adult up at 25 plus. We we go to the pub you are buying the drinks. DH had to restrain himself all the time and wait. Eg standing at the bar, he always paid we had to wait uncomfortably wait and order our drinks and go to the table etc and leave him to pay etc or whatever. Most of the time we explained what we were doing and why.
Over years we have now built up to him organising a trip for him and his dad from start to finish and booking it all.
He was reluctant and scared. He started small day trips out. He started taking to DH to the steam train place where he goes to watch trains and DH had to say - no I don’t like trains but I had a nice day with you and it was organised well. He had to sit on his hands - we had to talk through things etc eg fear - what happens if you don’t book? Or it rains all day? Or everything getting cash for a car park.
I appreciate this is your DH but if I can give you hope….
our adult step son with quite severe (on a scale of ASC) who previously didn’t even flush a toilet without being told, he did the following today:
he arrived at 8am and took our 12 year old Horseriding. He drove him there and back. He took him out for a cooked breakfast.
He took him to track and got pizza and salad. He took him to the park and played with him. He took him swimming and drove him to and from and got him a snack and we got back at 4 pm. 2 years ago he could not of actually done it - he would have stuck his younger brother aged 12 in front of the tv all day and I would of found he hadn’t been taken out or fed etc.
Your DH is not a child even an adult one. And it is so hard not to organise. I had an ex that criticising my cleaning of the house so I stopped - that was deliberate. Why do something if someone is going to rescue it?
I appreciate my adult step son is not a child and I’m not saying you need in any way to tolerate this and indeed leaving is a valid option.
I can only speak from experience with everything our adult step son did I let him lead, let him fail, and yes there were words along the way. Some hard words say with love and sometimes a bollocking. The time which he came around and used our washing machine without asking (and it leaked as he didn’t close the door properly so an inch of water in the kitchen) and threw my clean and wet clothes from said washing machine on a dirty kitchen floor didn’t let the dog out (who weed and pooped on the floor) and then used my tumble dryer on the hottest day of the year was a day I truly lost my shit and will be remembered. But he actually talks about it now as my ‘learning day’ DH was very gentle gentle gentle and He won’t do - so we organise it and o said to him Hang on? We are 35 years older what happens when we aren’t here. We aren’t helping.
I get it is exhausting. Praise, but yes it needs to be not a one hit wonder either eg I booked the hotel. Ok what next? Men as a whole and teenagers don’t understand the mental load either and it is huge. Looking after yourself is hard, a house x10 times as hard or an animal etc or a car
You aren’t doing him any favours by living like this. Is he lazy? Is he ND? Is he conditioned? Is he entitled? You know the answers I don’t.
please forgive my typing I have a broken wrist!!