<human>: She's an awesome person, smart, nice, low maintenance, etc. It makes me worried though, I keep having thoughts like, "What made her want to sleep with so many guys, so casually?" "Does she have underlying issues I don't know about?" "Does she not value sex the way I do?"

 Luckily, we have fantastic sex, and her "experience" doesn't overshadow mine in the slightest.

I've known this girl since high school, but we didn't start dating until she graduated (in 3 years, I'm finishing my 4th year). She had told me how many guys she slept with while we were just friends, but I was never bothered by it until we started dating. 

I feel like it what happened in the past shouldn't matter, but I'm always wondering...What do you all think?

Summarize the given text in a few sentences.
<bot>: My girlfriend was very promiscuous in college, and it makes me wonder what about her made that to be true?