Um, he doesn't have cognitive or memory struggles, but I don't believe that's all that testing looks at.

Don't let him bully you like that.

Maybe focus on the areas of the marriage that are bothersome to you?

For instance, feeling ignored when he tunes you out.
Feeling picked on when he focuses on your seeking therapy.
Feeling like the marriage is lopsided and not respectful.
At some point in time he must have had enough intense feelings to ask for your hand in marriage.
At some point he must have envisioned growing old with you. Where did that go?