Hi bigeric, i'm so sorry to hear about your situation!
I know totally how you feel... I just went over a breakup with a 40 year-old man i've been seeing (i'm 21). i really really like him, but all of a sudden, he doesn't feel the same way anymore... it's been a month, and i'm still really hurt...
i really don't know the reason why she broke up with you, but i can tell you that when i was going out with my ex, even though i really liked him, i still felt a bit awkward when people stared at us. of course, this reason never overtook the fact that i loved him, so it never became a reason for me to break up with him...
