what do you think ?

me and my bf been together for about 6 months and we love each other genuinely. im usually happy with him and everything but lately not so happy. we argue everyday. usually when we are around each other. when we arent together (on the phone or ft) we dont argue we miss each other. when we are together almost every little thing irritates me that he does and then we end up arguing. what could this mean?

thanks !