Best of wishes to you.
DH has type 2, as did his mother. He is mostly in denial as she was. You would think that watching what it did to her and her eventual life/death in a nursing home would "scare him straight". But it has not.
To try to show a good example and for my own health, I live off grilled or baked seafood or chicken with minimal add-ons. A little salt/pepper/lemon for seafood. A little spice on chicken breast (which I cut in half because they are too big). Lots of green, orange, yellow and red vegetables - baked, roasted, broiled. No white carbs - bread, rice, pasta, potatoes. A snack is fresh fruit.
He adds globs of sugary bbq sauce, white rice, potatoes or pasta, bread with lots of butter, mounds of cheese and finishes with ice cream sandwiches.
The point is I can't control what he does. He just wants a pill to fix everything and while there are medications that help, he still needs to change.
All you can do is offer healthy alternatives. The rest is up to him.