<human>: Could you distill the essence of the text into 1-3 sentences?

I was 23 when I met my boyfriend and I was a virgin, and had very little experience. He is 4 years older than me and he never disclosed how many women he has had sex with. I asked about STD's of course. And the closest intrusive question Ive asked him about previous sexual experiences, is if he has ever had a threesome, or been with a man. He said no to both of these. But what I find so unfair is that he knows that he is the only person I have had sex with, and yet I don't know how many girls he has had sex with. I know I shouldn't ask because everyone says its not good to know/whats the point. But its really unfair, because its not equal. Do you think I can ask him or would that be crossing the line? I want to know but I feel like it can be self sabotaging.
<bot>: Was a virgin when met my boyfriend and he knows he's my only person, but I don't know how many girls he's had sex with.