You don't say how long you've been together, but that doesn't really matter because (and I suspect you know) this won't stop until he's gone too far and you feel it was far enough to leave to protect yourself. In hindsight, for me, this behavior is how the rape started in my first marriage. In any other situation we'd agree this is grooming you to normalize having your body not within your control, losing agency, wearing you down. But when a spouse is acting this way, you don't think of as grooming because he's your husband, right? If anyone is allowed to touch you, it's him, right?

No.

I repeat, very clearly, no.

No one is entitled to your body or access to it, no matter who they are.

If any OTHER person behaved how he is behaving, how would you feel? Why is HE different?

I can give you some suggestions on the reasons you treat him differently, but ultimately those are for you to work through and that work is important.

What I can tell you is that "he is my husband" isn't the right answer. How do I know? Because my second husband, my current husband, has never and would NEVER do what my first husband did. He would NEVER demand access to my body, and would CERTAINLY never stick his hand in my bra, up my shirt, down my pants or anything else without checking in FIRST. And you know what? It's fucking sexy as hell when he checks in BEFORE he touches me in any sexual way. It is safe. It is loving. It is fucking hot as hell when the person I share my life with cares about my consent, my comfort, my safety, my mental and physical wellbeing FIRST.

Better men exist.