eVerY MorNinG thEreS a HalO haNgiNg oN the cOrner oF my GirLfriEnds FouR posT bEd

it seems that's how I feel anyway... I think he thinks that's where I hang my horns....not sure what's going on with us lately and how you determine what is... not sure when somebody seems to be treating you differently how you find out what the root of the problem is...what exactly are you supposed to do when the way your being treated upsets you but then somebody keeps telling you the way they treat you is because you're always upset? is it really that women are upset too much too often or could it possibly be that men are actually upsetting us?all I wanted was a normal Sunday ...last night was anything but. well maybe that's untrue.. I suppose it would be fair to me to say that last night was the normal Sunday.  it seems all we ever do is fight anymore. I wasn't feeling good at work ..don't know if it was a panic attack or just smoked too many cigarettes the night before out of stress but my heart was killing me I felt dizzy ...I came home needless to say and hoped that he would be here. I text messaged and told him I was on my way..he told me hed rush home and stay with me. I did the girl thing.. Insisted he stay at work but he said no he would rather be here with me. Everything went good during the day..we spent time together. we watched TV ..made some plans about some of the ways we want to make extra money.. everything was fine until bed time... He wanted to shut off all the lights before walking up stairs and I asked him to wait just a second while I ran to the bathroom so I could grab my toothbrush, I hate walking around the 4000 square foot house in the dark by myself.. I'm not very superstitious obut something about it frightens me at night time... I know he has a short fuse but all I was asking was " hold on before u run upstairs before me n leave me down here because I need one second"...  That was all it took. "God just get me to bed!" So IRRITATED that I wanted him to wait for me.... Which escalated...  Into 2 am and tears....into little sleep and continuing upon awakening..  needless to say now I'm exhausted my chest is still hurting and I have a fiance who left me for work today while I stood there crying at the door... is it possible that we get so wrapped up in ourselves that we never really do see what we're doing wrong? I try very hard to be a reasonable & compromise but lately I really do feel like its not been me I know he feels the same way.. so is it possible for one of us to have a breakdown? is it possible that someone just say sorry when they're not? and is it possible that "sorry" really FIXES Things? is sorry all it takes in a relationship the entire way from beginning to end.. from "I do" on..is "I'm sorry" the key to making any lasting relationship work?