Sorry to hear that. Breaking up after that long can hurt really bad. Only time will heal you. And, if this is 100% final, only advice I can give you - re-focus

Sorry to hear that. Breaking up after that long can hurt really bad. Only time will heal you. And, if this is 100% final, only advice I can give you - re-focus on doing something, away from your feelings. Hacking, traveling, speaking out, searching for new job in new city, etc.