Should I ask?

So I’m not a virgin, my boyfriend knows this, I had sex with one dude. Except I’ve never asked him if he’s one or not. It wouldn’t change my feelings because we’ve been together for 2 years but I’m just curious and I’m not sure how to ask? I’m not sure if I should even ask? We’re not having sex anytime soon as we’re currently in an ldr so I guess it’s not important?

Edit: He knows i’m not a virgin cause my ex and him used to talk and we were all friends so i told my now bf when my ex and I lost it back before we were dating. And it’s never come up as we’ve never really talked about sex until recently.