How Do You Deal With Living With A Manipulative Person?

I have been thinking about this for a while and need some advice or a pointer in the right direction. I am with a boyfriend who I thought was stable but turns out is not. He is very manipulative and I am unexperienced in knowing how to deal with this kind of personality. Basically, we moved in together and although the rent was high he agreed that as he is earning more he would foot more of the bills. Since living with him he loves to spend money on fun stuff on things he likes to do and sometimes buys me gifts when really we need to pay the bills. I end up having to use my credit card to foot additional costs that he is taking little responsibility for.
I get angry and we argue alot about this, he makes all kinds of threats to me and even though his parents have seen his tantrums and unreasonable behaviour they just shrug their shoulders.
I am getting frustrated and really need to form an exit strategy. I have another 7 months before the rental on this property ends but in the meantime he is driving me mad. I am worried to get a higher paid job as he will then make me pay for everything despite having to pay the credit cards and I will end up getting no further.
He likes to spend on lavish holidays but I end up having to pay the bills when we get back. I refuse to go away with him again and he is threatening to book the holiday and willing to blame me for it if we do not go.
What can I do?