She can turn on you quickly. One day you're the "greatest love she's ever had". A week later, you're the devil, she's done w/ you, and it's your fault.
Don't hate women for this. She needs more from a man than you need from her.
A man quickly figures out if he wants a woman. He looks for sexual availability, fertility cues, good health, and nurturing instincts.
Women depend on a man for so much more, so it takes her longer to know he's "the one".
Once a woman mates w/ a man, she's sexually unavailable, vulnerable, and her life DOES depend on his performance.
Women are fickle b/c they have more qualities to assess & more risk.