Should i apologize or should she apologize?

me n my best friend are fight because this boy cursed her out n she ain't do nothing so i toke up for her n threw a book at him n then he threw a lotion bottle a my nose n she ain't do nothing all she did was smile n laugh n at the begin or the school year she said oh i got your back n i wont let no body touch you or hit or let them talk to you any kind of way...so when this day had came im thinking that she going to do something but she didn't.....