The hard part is over.
I'm matching you with one of our specialists who will be calling you in the next few minutes.
Giving up driving is one of last few bits of independence someone has. It is tough for men and women to hand over the keys.
My Dad use to want to drive, and that was a hot button for me whenever he brought up the subject. I would tell him he and Mom could lose everything they worked hard for all their life, and he wouldn't want that to happen just because Mom found a sale on soup.
Here's a good article to read, keep scrolling down through the ads. https://www.agingcare.com/articles/taking-the-keys-what-to-do-if-mom-or-dad-won-t-give-them-up-112307.htm
I would hope his doctor would give him this message. And DMV should be notified so his license is cancelled. Or at least they would have him take a test.
To my husband, the very hardest part of having dementia was needing to give up driving. It is very sad, and I feel sorry for your husband. But it is necessary.
Try to get the help of his doctor and DMV, so you are not the bad guy.