Backstabber????????????????

i really like this guy who rides my bus, we hang out alot and then we got into this fight (but made up) and if we hadnt got into that fight, he told me he was going to ask me out, but after the fight he said that it just wouldnt work out.... so he met my EX- friend and she was flirting with him and giving him hickys and everything... later that week he asked her out and she said yes. she knew how i felt about him and now they are dating (btw he is moving in june) my EX- friend has already had 3 bf's this school year... shoud i not talk to her for stabbing me in the back like this b/c she knew i liked him alot and im not really sure how to handle a situation like this im only in 9th grade???