Originally Posted by
akrasia 
The apartment is right in town so I could still look after him. What I want is for this burden to just be gone, from both of us.
That's a contradiction. You want to look after him and you want the burden to be gone. Which do you want more?
If you want to look after him, you will have the burden, and it's going to get worse.
If you want to put down the burden, you have to stop taking care of him.
It seems you are missing what people are telling you about how helping him is the worst and cruelest thing you can do for him.
He gets to choose when he puts down the burden, and you get to choose when you put it down; chances are very good you will not choose at the same time.
Also, what's the point of moving out if you are still going to look after him?
And...who's looking after you?