I've been dating a girl for some months now and she recently told me her body count (19). Most of this was during her first year of college.

I've been trying to understand why I feel so disconcerted for the past day or so. It's such an unsettling feeling. Breaking up with her is definitely an option in my mind, but I am just trying to understand why I'm feeling this way.

Can anyone shed some light? Is something like this a dealbreaker for others? Is there a right way to feel in a situation like this?