He never did remember her again.
I have heard that can happen because the one with dementia remembers the YOUNG person they married, and not the old person they became.
And yrs, x3? on the many kinds of dementia. Which is good in a way... because some have causes that we can now understand.
Some is just due to reduced blood flow to parts of the brain, where just improving collesterol levels and stuff like coffee (that helps dilate capillaries / improve blood flow) can slow progression.