I disagree with the advice being given in this thread.
I say pull a pre-emptive strike and start seeing other girls. Once you find one you like distance yourself from this girl and only use her for sex. Also start making her pay for things such as your meals and dates.
Not only do you get a free ride with sex, but eventually she will get pissed and dump you thus keeping you from having to do it. You won't care however because you will have the other women lined up that you've been seeing behind her back.
Heck, basically you are only doing what females love doing to the guy, only you beat her to the punch.