Let's face it...some women can be ruthless. There are certain women in world men simply DO NOT want to get mixed up with. I call these women "grand manipulators" because they will use every trick they can think of to get you to do what they want, when they want, and how they want.
I once knew a woman who was epitome of manipulation. Her view of men was that they were a necessary evil to get things out of life she wanted. She would use them, abuse them, and then kick them to curb once they had served their purpose.
In beginning of relationship she always seemed to be a sweet, caring, nurturing woman to men she chose as her prey. Once she'd gotten what she wanted from them she'd turn into a screaming witch of a woman in order to drive man away from her.
For instance, she once decided she needed a new car but was unwilling to foot bill to pay for it herself. Not that she couldn't afford it, because she could. She had a job and earned a very good salary...good enough that she could afford to put 40% of each paycheck into her retirement savings. But to her it was unthinkable to temporarily lower percentage she put away in order to pay for a car herself.
She found a vulnerable man as her prey. It was truly amazing how she lured this man into her life and her bed. She put on her best act for him. She was all sweetness, smiles, and honey. Once she had him "hooked", so to speak, she began to play on his sympathies by complaining often about her old worn-out car and how she just "couldn't afford to replace it because there's no room in my budget for an expense like that".