Stuck with a fired heart.?

ive been in a relationship five yrs. he has never acted this way. he now texes me once every blue moon. when i tex him he responds three, four, five hrs later. he doesn't call anymore, even when im breaking down. i confront him and tell him hes changed but he just says"no i haven't". lately ive gotten bad phone calls from my ex. i try to tell my b.f but he don't listen. he claims he doesn't wanna talk because when he doesn't say what i wanna hear, im crazy. i was wondering if i should give up on me. on him or try harder .i love him iwont lie, but the stress build up is killing me, the ex is driving me crazy. my b.f says he still loves me but i break down in tears when hes not around! he says i cry a little too much. What should i do? I cant talk to him. And i don't know what else to say to solve this problem. With him and my ex. I know this is a difficult question but i was wondering what everyone was thinking that could help. thnx