Attitude Adjustment.

I just moved into a new place with my boyfriend. We've been living with each other for 6months with his father, this is our first apartment on our own - and ever since we moved in he keeps coping an attitude with me about everything. Things I say, things do or don't do so I give attitude back at my ropes end. How do I fix this or at least take a step in the right direction I can't keep doing this, his attitude is poisonous.