How much do girls remember their first boyfriend?

I went to my school sort of "party" where everybody goes, students, teacher, former students, etc. I was walking through and I don't know how but some way I look straight to my ex girlfriend, who was my first and we were together 2 years, right in the eyes and did too, we both did it at the same time, although we broke up two years ago I has happened the same before with she in other places like a time in a mall. Well after that I started to wonder has she forgotten me? and then a bigger question... that I ask girls to answer disregarding my case. How important is their first boyfriend and how much do they remember him?
How much do girls remember their first boyfriend?
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