My Best friend (17) hooked up with a 22 year old guy

To give you context we’re both girls and we super duper love each other. We’ve talked about being each others firsts a billion times. Now today I learned she hooked up with a girl she met a week ago to “lose her virginity before she turns 18”. Tbh as I write this I’m crying. I feel really sad. I know being someone’s first isn’t a big deal but I can’t help but cry