My questions quite boring - but please will someone answer?!?

I feel like I have given my all to my relationship over the last few years and stood by my man whilst he was in the forces and all the decisions he made. I was the dutiful partner whilst he was away most of the time and made our house a lovely place to live. I always made an effort when he came home and wanted to live the rest of my life with him. We split up Xmas 09 as he wanted to be more of a lad than a partner and then his Dad gave him a dressing down and so he came back to me and stupidly I took him back. He promised he would change and to give him his credit he did. Then he proposed March this year and we planned to get married May 2011. So the rest of this year we have been planning this. We have had our fair share of niggles along the way and my partner gets very stressed out about arguments as he has come from a family where arguing never happened and things were hidden away from the children. He therefore thinks relationships should be perfect. I don't mind having a good old argument and then being fine about it afterwards - otherwise where is the pion?! Just recently though I have to admit I started to find him really annoying and I started snapping at him for no reason whatsoever. I have had a lot on my plate recently with a long standing family issue and dealing with his parents re our wedding, trying to figure out what I want to do long term with my career and organising our wedding, dealing with my partner going self employed and all the usual day to day stuff. So yes, i've been stressed out. Lots of things were said in these arguments, I said something like 'if it weren't for the house and our wedding - I wouldn't be here' at the time in the argument I meant but afterwards I didn't. He called me a ***** etc After the argument he couldn't just leave it and was in a sulk for a few days afterwards. I suggested we went for dinner the following day to clear the air - which we did and I thought managed to thrash things out. The following day he was still odd however and I felt odd and started crying as it all felt awful and I was totally fed up. He then told me he was having doubts about the wedding because of our arguments and feels couples should have 6-12 months of bliss before the wedding. This is the second time at Xmas he has split up with me because of something he deems is so wrong. I feel totally disillusioned with everything at the moment.