Relationship help. trying to move on but cant..?

me and my boyfriend of 18 months just broke up. actually we had a big fight about two weeks ago and havent talked since then..besides a text from him lastnight from him saying hes sorry for anyway he might have acted. its so ******* hard to get over it. he was like a brother and i hate bieng alone like this. im hanging out with my friends more but i get so upset when i have nothing to do...why have i become so attached and dependable? how do i get over this..metting new people only makes me upset, and im trying to keep busy...