Totally agree there, I don't see the point of walking without dog!
Maybe he's struggling himself, and to say no way, never to another dog is his way of making sure he never hurts like this again?
Just an idea, I don't know your OH obviously.
I used to just take myself off and cry when I lost Chewitt, as like you, my OH thought I should have been ok after a few days. Also I had to be strong for the kids, as if they saw me cry, it set them off. I had to get OH to put everything of Chewy's away, as I couldn't even look at a food bowl without falling apart.
It's a horrible, horrible time, but it will get easier, it just takes time.
Take care, and I hope things sort out between you x x