Relationship problems

My boyfriend sometimes is irritable towards me and is really cold for no reason and it makes me really upset like i start sobbing and then he says im overreacting and it makes me really upset like i dont know what to do, i know im an emotional person but its not my fault i’ve grown up my whole life being mistreated, and even now I still react to it really emotionally - like , I’d never do something like this to him so why does he do it to me? I’ve told him to stop, and that even me asking my own boyfriend to be NICE TO ME is stupid, I shouldn’t have to do that. And last time he did this he promised even though I shouldn’t have believed him he promised to stop and it hurts even more he hasn’t. We have a good relationship literally 99% of the time but when this happens I feel like my whole world is crashing down, it’s over the phone this stuff happens and it’s literally me sobbing because my brain simply doesn’t understand why he does it. I hate it.