Unless it is directly related to their relationship now (risky behavior, children, former long term relationships etc) then he doesn't have a right to demand the chapter and verse of her sexual history.

It is controlling, creepy, and unhealthy. What she did in the years before they reconnected isn't any of his damn business. Maybe she slept with a girl a few times in college. Maybe she has a few guys who she doesn't remember more than Dave from History. Maybe she had a few boyfriends before her ex husband.

It is her past. Not his.

The new boyfriend is way out of line.