Cant get over a guy??!!?

i tried to get over this guy i liked for 3 years and i even tried dating other people. The guy im tring to get over is kinda a jerk and im pretty sure he doesnt like me back. i just miss when he used to NOT be a jerk. The guy im currently dating- i like ALOT but not as much as the other guy. Now the one im dating is going to a dif HS (im starting freshman yr in sept) and the guy hu i CNT GET OVR IS GOING TO MY HS!!! am i gunna die in hs? plz help me 1)get over him or 2)any other option????