Breakup..

Hey girls, I was in a relationship w my dude for 2 years. Throughout those two years I caught him multiple times texting girls and being on dating apps. We recently ended things and he moved on like nothing meanwhile im stuck .. im stuck on him and i can’t let go .. idk what to do .. any suggestions? pls help .. i don’t think he ever loved me, i think i was just a toy to him but it felt good having somebody to love on. im super sad, idk how to cope w this ig i was so used to him but i can’t let go pls give advice ..