Girls, Do girls forget about their crushes?

I was talking to my girlfriend when she told me that she had a strong, and i quote 'STRONG' 3 year crush on one of her classmates (he is still our classmate and we are still in school). I asked her if her crush is REALLY over, to which she replied that i wouldn't be her boyfriend if it wasn't (she was the one who proposed). so my question is, do girls forget about their crushes or is he still a danger to our relationship? She also told me that I was her first crush but then our classes changed and it was at this time that she developed a crush on this guy. But after 3 years our classes again became same and she proposed me. She told me that she thought I needed to know this.(note that she didn't tell even her best friend about this guy, and never proposed him).

Girls, Do girls forget about their crushes?
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