How am i supposed to feeel?

monday i got beaten up at skl by this bich that was picking on me cuz i'm breathing and i've never done anything to her well i just found out a best m8 of mine (who's a guy) is going out with her and didn't bother to break up wiv our friend (who's a gal) and i feel betrayed i dnt wanna go bak 2 skl but i av 2 cuz i'm in year 11 n i dnt have a choice wht am i supposed 2 feel ?