How do i get over my bf?

i was with him for almost 3 years since i was 15 now im 18 he was my first everything we just recently broke up i admit i wanted time but i miss him so much he disconected his phone i have no way of talkin to him idk what to do sometimes i feel like movin on but sometimes i get so sad i feel like my life is pointless without him what should i do? we broke up cuz we wer fighting alot n it just wasnt the same but what if we never get back i will go crazy without him