Regarding women that you want to have a lifelong ltr with and potentially kids is there a rough number or red flag?

I’ve been interested in girls in the past but they have had a tendency to cycle through men and had already racked up 50-60 guys by the age of 20 which made me doubt there suitability.

Or should I say just say fuck it, every girl has fucked more guys then I can count I might as well not think about this at all.