Paano mag move on from a crush na may iba na (ata)?

Okay so for context, I've had a crush on this girl for like 4-5 months now and recently nalaman ko na she's seeing someone na pero they aren't in a rs pa, and after na malaman ko yun, sobrang nasaktan ako for some reason. Idk why kasi its just a crush lang naman pero maybe I expected too much. Hindi kami full on friends ng crush ko, pero if ever may instance na magkasama kami, hindi naman awkward yung mood and like masaya pa nga. Maybe marupok lang ako kasi sobrang nasasaktan ako at the moment to the point na hindi ko na magawa yung mga need ko gawin for the day. So i just need some advice on what to do para mawala yung nararamdaman ko and how I can move on. Fyi, I already go to the gym/workout so need ko ng iba pang advice bukod dun tyy