Dear Johnsoj2
What devastating news for your husband and yourself - at 53 he is young to have this diagnosis.
Have you done the right thing by telling him? Well, you obviously know him best, and what his particular problems are, and how your relationship works.
If he is still able to understand well (albeit with an element of denial where he says that he thought it was curable) then it would be difficult to hide it fully from him in terms of what medics say in front of him, or the clinic you might visit to see the Consultant, etc etc.
But having said it, and seeing his devastation, perhaps it is now time to just let it sink in, as much as it can, and work on how to deal with the problems as best you can. You have a name to identify what is causing the problems, now you just need to find a way to live with them. I'm sorry, that sounds so simple, and I realise it's not, but I guess it is the bottom line. When my mum used to ask what was going to happen (she had a lot of insight with regard to her dementia) I used to tell her that I didn't know, but that we would try our hardest to make it the best it could be. Obviously I couldn't guarantee that, but she needed to feel reassured.
Read here on the website about what help there is out there, and join in with the forum if you feel it helps, or just read about how other people are dealing with their lives and particular problems - always remembering that each person's dementia is peculiar to them, and whilst there are similarities there is no set path.
Best wishes x