And the "Mrs. Hyde" thing is a pretty big deal, no? I'll bet it's a BIG part of why you two aren't married already.
Some people DO change in weird and not so great ways after the big M (we didn't) but I THINK that's more for couples who don't really know each other all that well, or who have unconscious, implicit "scripts" for what H's and W's should do/be/act like etc.
I have a HUNCH you two are WAAAAAYYY past all that!!!
Shiny
P.S. couldn't hurt to reassure him on this count though!