Lately, his attitude has me suspicious of him when I am not around. It makes sick to my stomach. I know my life would never be the same without him. His business with his business is not your business. As long as he keeps the volume down on his late night movies and the level of intimacy up with you, his business shouldn't be a problem.
Relationships go in cycles.
Sometimes they're up and other times they're down. You may just be one of the down cycles. Beyond a little self-fulfillment, I don't see why you're so suspicious. Take this as a perfect opportunity to add a little spice to the relationship. Go away for a weekend, buy something sultry, be spontaneous, just do something different that may take away your suspicion.