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Sorry to hear that.
Sometimes knowing why can only cause more pain. Probably her feelings for you have changed, what more do you need to know?

idem dito, my girlfriend broke with me 2 days ago, in this case is it is true what @quoteoftheday
say "Sometimes knowing why can only cause more pain." @janus27 May I give you some advice. Start studying the law of attraction. With that knowledge you can win her back or attract a better match in your life.
I hope the pain may go away soon, I wish you strength and success.

Thanks bud