Most Helpful Guy
It's time to move on brother... First thing you need to do is put your mind into other matters, take up a new hobby, burn off your energy, exercise, running jogging weight lifting... You have to start redirecting your thoughts... start reading, plenty of self-help books out there as well... You may not see it like this now but she is one drop of water in an endless sea.
I wouldn't advise going back to her as a friend, what you need to do is get your mind off of her completely... you are past the point of being friends with her, friends are not going to be jealous of her talking to other guys, and you will be.
Quit playing the endless loop recording in your mind... chalk it up as experience and know that you will have plenty more experiences in your future both good and bad... Embrace the good and let go of the bad, it won't benefit you to embrace the bad.