@IceLollipop so ASD presents differently - as we all know. DH is so self-sufficient as to be completely cut-off from the rest of his family. Whereas your DH is at the opposite end of the spectrum and so reliant as to for your role to be more like a carer. Both are impaired you might say in that they are extremes that mean living with these people cause pain to those around them that don't function in the same way as them. You and me are somewhere in the middle, right?
I'm very sorry you're going through this. It sounds like a very sad and stressful situation.
Perhaps you being around means he abdicates responsibility for himself knowing you'll be there to help. I know when I have left DH on occasion (3 times) it causes some reflection about his behaviour and how he could improve. He improves briefly, however, sadly after returning within 2 weeks or less, he is back to how he always is.
However is is proof that however uncomfortable it may be for them, they can be different, it's just not their preferred mode.
Whereas we live with uncomfortable all the time.
I cannot advise, only you know what is best for you but it certainly sounds like you could do with a break - just for your mental and physical health.
DH doesn't mind when I take the children and I away on holiday. He knows the heavy toll it takes on me with his heavy workacholic lifestyle and his thorough absence as a father. I need a rest and to restore myself somewhat so I can get through each year.