Jazzi - dont let him treat you like this, why dont you sleep in the same bed? He is treating you like you mean nothing to him.
I think it is totally unacceptable behaviour. I dont go out very often, when i do, im home relatively early and i certainly dont come home crashing around drunk. For your DP to act like this is disgusting. The same as it would be if a woman with children did the same thing. Im not saying people can't go out and enjoy themselves, but when you are in a relationship, you have a responsibility to the other person too. Why the hell didnt he arrange a babysitter so you coudl go to the BBQ - sorry, but he is acting like a cock