I think the crying is you being stressed and also probably hormonal. Don't discount how important hormones are in how you think you're feeling!
Personally I think you just need some time apart. I know you love him and want to spend all your time with him, but its just this kind of thing where you see each other all the time which causes you to drive each other insane and cause premature ends to relationships. I've been there and its stupid. I don't mean dont see each other at all, but try and limit it. See if that helps.
And try and start assessing your moods - if you're being totally irrational about everything its probably just your hormones going crazy. Once you realise that it makes you calm down a bit.