Andy,

Your child needs help for the rest of his life, yes. He has siblings who, when they are older, will be able to help you and your W w his care.
I have friends who realized that their child's care needs surpassed their abilities to manage and they sought help with this. It is out there, friend.

Your future as a couple isn't dead. You have to figure out a new path to that dream.

All you have to do is be able to wish it. If you can do that then you can find the way.

I believe in you and her.