A large amount of women (fortunately, not most) genuinely have no respect for the opposite sex, all hidden under their hypocritical smiles and makeup. They don't need to if they are attractive by conventional standards, it works, far too many men are stupid and think with their penises, so are willing to take abuse in exchange for sex or even the false promise of sex. This comes out in their preference for mate selection - a man doing all the hard work chasing her (while she does nothing) proves he'll make a good slave, sacrificing and immolating himself to her by doing all the hard work while she does nothing. This typically sets the pattern for any lasting relationship which ensues. It's often considered the woman's natural right to take from a weak and stupid man and mercilessly exploit him under a hypocritical mask of "love" - that is how the species is perpetuated. This is not a cynical view, but stating a verifiable fact of human nature. Of course, any man who points this out is scum and a pig, as it doesn't flatter many women's insecure egos, nor align with their political agendas to look good, nor their ulterior motives in which many such head games depend heavily on two-faced deception and hypocrisy - with the man stupidly trusting her.
The trick for a man is to turn the tables on a woman who feels genuinely entitled to prey on and exploit him without concern for his well-being, when a clear-headed and sober view of the situation at hand reveals that this genuinely is the case - maybe playing dumb for a bit and letting her think her game is working, before turning the tables and mercilessly letting both her and her social group know exactly how she behaved under the circumstances, what you think of her and the reasons for it. When this is executed well and with genuine skill and finesse (with the support of like-minded individuals), it will not go well for her, either in terms of her emotional hurt, nor in terms of her reputation. She'll find the "decent" men don't want to know her and she will have to either move away to a new area (leaving her friends behind) or settle for someone stupid and/or abusive long-term. Or be a nun.
Some lessons are only learned the hard way. Of course, she'll hate you for it. Consider it a badge of honour. Her peers will quite likely learn the lesson by proxy, too. I can't think of a more genuinely humanitarian act than "heads up all round" concerning a person like that. After a person has been on the sharp end of such games, anything less is enabling and cowardly complicity, in my book.