Really need to know what to do now

I need to know your opinion… I’ll keep this short.

For the past year and a half, I’ve been head over heels in love with a girl, and we met for the first time two months ago (we live far apart). I’m 22 and she’s 19.

Over these two months, I was sure I’d find something about her that would make me not be so in love, but during those two months everything seemed perfect—everything was just as I’d imagined it for those nearly two years. So I’ve already given myself 100% to her, telling her I love her and want her to be my girlfriend, etc.

We’d already talked a while back about how many exes each of us had—she said two and I said two—nothing unusual so far. Everything was fine.

But suddenly, during a video call two days ago, she told me that, counting me, she’d had sex with about 11 men, and that with one of them it was in a corner of a nightclub… She tells me, “We hooked up at the club, he turned me around, I felt him enter me, and I just let him…”

After that, I was speechless, and I’ve been wondering what to do for the past two days… It’s crystal clear that I don’t want her as my girlfriend, but I don’t want her to feel bad. Please help me!