My fiance and I broke up

I'm 20 years old my boyfriend proposed almost a year ago and we broke up almost 2 months ago but I can't seem to get better or get over this break up . It's my first heart break I don't know what to do . I don't know how to feel better . I can't get over him . He's been my friend since we were 12 and started dating after highschool and we were engaged for 9 months . And we were living together for like 7 months, everything was great. And now I don't talk to him because I tell myself it's best I cut him off completely . I just want to get over him because that's what he seems to be doing.