Yeah, nick, she'll just keep using you forever. Cut her off. It's the best thing to do. You don't have to be an asshole about it, but do something to take a step back. You'll be better for it in the end even though it might be a hard choice to make.
I've realized that some things are consistent between all women, and that's that they will never tell you exactly what they mean, and if they do, what they actually feel is different from what they told you. And if you ever think you're on the same page, you probably aren't. And if they ever tell you they won't do something, they may do that selfsame thing, possibly very shortly after telling you how they won't. And if they ever say they understand where you're coming from, they don't, and this will become apparent as soon as they're pissed off at you about something they understood or as soon as they fail to understand why you're upset about some issue you formerly thought you saw eye to eye on. And they may do things to you that you know they'd want your balls for if the situation were reversed, yet will act as though they can't imagine what in the world could possibly have upset you when they do it to you. Oh, and as nick already pointed out, they'll often mix and match these things while happily taking all the support, comfort, and encouragement you're willing to give them, along with time and money that you will give in earnest because you care but will get little to no return on, be lucky to break even with, and most likely never see again.
There are exceptions to these, and some women are certainly worse than others, but in my humble experience, I've yet to meet a woman who didn't at some point indulge in at least a few of these traits from time to time, and most of them have been pretty consistent once you get past the surface woman and find the deeper one. These things can and will often make you look like a complete idiot to people who are viewing the two of you from an outside stance, especially if people only know half the story (which is usually the case, and likely because they don't give enough of a fuck about you to even ask about your side of the story) and thus think that you're somehow being overly emotional or stupid or making too big of a deal about something. And really, who cares what the guy thinks? He's just a pig and only out for sex and couldn't possibly have anything of nobility or weakness or humanity in him, none of those things worthy of your respect or sympathy. So fuck that guy. Let's talk behind his back about what a pile of shit he is instead.
I will always love women, for some inexplicable reason, just like most of you. But I'll be damned if I have even the slightest idea why. And to be fair, half of what I said does in some way apply to the duplicitous and uncharitable natures of people in general. We're all selfish creatures at the end of the day. I'm not a chauvinist, I'm just tired of being fucked by people I care about, irrespective of gender.