I need some advice about friends and dating.... :(?

okay so, theres this guys. ive liked him SOO much for like 2 years. and he new i liked him. he even liked me. untill me bestfirnd started talking to him.they went to grad together last night and now theyre dating and she didnt even have the guts to tell me i had to find out myself. they danced together and she hasnt been talking to me. :( he sends me hate texts now to. but the funny thing is that she used to tell me that hes ugly and she hated him. but i found out from another friend that she had been talking to her and apparently really wanted to date him and now everything is messed up. please help :( any advise is appreciated <3