Husband asking body count

Early on in our relationship, my husband asked how many people I’ve slept with. He then said never mind it doesn’t matter. Idk his number but he said it’s few and I believe him. He knows mine is higher, but never asked for an exact number.

Truthfully, I don’t even know off the top of my head what my number is. In the 20s I guess. I’m 30 and have been with him for 9 years. Idt my past does matter at this point.

But recently he found out my ex (when I was 18) is someone he’s become buddies with at the gym. Now his insecurity is driving him mad. He doesn’t believe me when I say he’s the best I’ve been with. His patience is low, he’s on edge. It’s like this is just bubbling under the surface, and anything stressful that pops up he can’t handle now. It’s been 3 months and he has not improved. I believe he’s acting as if I cheated.

But anyway, cuz of this crap going on I’m worried he’s going to now decide he wants to know my number. And I don’t want to tell him because it will make matters worse. It’s not going to be helpful information to him.

Any advice?