Dang! sad to hear that. i had kinda similar situation back in the days. My rommie had so called GF but her attitude was real bitchy. We 3 were living in 2 BR appartment. But, that bitch didn't wanna split up expenses rather kept the common groceries (juice/soda/culinaries) in mini cooler in their bedroom and even had extra microwave in their bedroom. . 2 of us had contracted the apt. Finally, i raise the hell n gave option either u guys leave or let me leave. I left making another contract including the management telling im no more liable for anything on the apt. neither the rent. Kick the bad ass if you have way out. That asshold n the bitch are still around the city but never have  spoken to, then after.