Like others have said, find another girl you can date. Sorry. You were friend-zoned a long time ago. You should just accept it, and move on. It sucks, but it's part of growing up. Don't dwell on her, especially since you were never romantically involved. Now, this doesn't mean to cut her out of your life, but you need to be honest with yourself about what you want out this friendship.
Are you her friend because you hope it leads to a relationship down the road? Are you her friend because you enjoy her companionship? Can you stomach hearing about her new BFs?
Also (and I've said this many times here), I was always leery of ladies with tons & tons of guy "
friends", and few (if any) girl friends. Almost always correlated with the lady never really being single, but rather jumping from relationship to relationship. Fun girls to hang around with, but probably not the best option for a long term relationship. Your friend may be the exception, though.
Also, sorry to use you as an example, but this...
...is exactly what I refer to when I (and others) claim men & women can't be 'just' friends. Oh sure, you guys were friends, even Best Friends at that, but you would've jumped on that at the first opportunity.