If I had a nickel for everytime I've asked myself those same questions, I could buy Donald Trump a better toupee'. We all lose our focus at one time or another. I do it a lot, but keep it hidden under an air of invincibiity, except on these boards.
We've spent so much of our lives taking care of our H's, that any dissatisfaction/unhappiness on their part seems a reflextion on us. And that's just BS. Throwing their guilt off on us is just part of their pattern.
I know this is not part of DB'ng, but get out your needlework and embroider yourself a little wall art. "Living well is the best revenge" I have one that says "I'd rather be alone the rest of my life than with someone who makes me feel less than special."
He will notice you are moving along toward the future resolutely and with confidence. By that time, though, you may not GAD.