Well,imo she still thinks about you if she texts you.
I am in same situation like you,she got with other one in her class. but i’m not in sane school.
Just do NC 1-2months (atleast for you ,she text you,but mine just ignores me and shes moving really fast,trying to piss me off).
Try to hit the gym,new haircut,and socialize more with people.let her think you just got over it ,this will make her reallize and miss you(atleast i think she already miss you),and after the NC when you are a new start,try to message her ,date ,take all cool ,and i think you will be back with her.