I'm getting picked on about my body count.

Okay so there's this guy I'm talking to, and we've been totally fine. Joking with each other and all. Let me begin by saying I've had a rough past, my body count is up there a little, and the guy I'm talking to is best friends with my ex best friends brother. And my ex best friend knows literally everything about me. So I'm guessing today his best friend told the truth about me and now he's calling me "nasty", a "whore", and so many other things. He's now asking if its true, and I dont know what to say. If he wasn't such a dick about it I'd tell him, but now I'm scared, and I'm also VERY depressed. Any help on what I should do?