Pregnant.. boyfriend bought "us" a house.. wont give me my own key?

So i am pregnant.. and my boyfriend bought a house for "us" but he won't give me my own key.. so i keep all my clothes at my parents... and all the stuff i been getting lately for my daughter is too at my parents house in my room.. i pretty much sleep at "our" house and only there when he is but as soon as he leaves for work or school i leave and go back to my parents house until he's out.. im iffy about using my foodstamps to put food in a fridge that i don't have access to unless he's home.. is this right?