Women are inconsistent.
That's it.
I mean, so are men, but women are REALLY inconsistent, flighty, whatever you want to call it.
They think they know what they want, kind of, pretty much exactly, since they were young. They have these ridiculous, idealized, Disney-fed ideas about perfect relationships without quarrel, where issues are easily resolved and men know how to listen to them.
In reality, when they SAY they want something, they may only be saying it, when it's not what they want, what they really really want.
So you say, "Tell me what you want, what you r-- ah, fuck it."
Women are scatterbrained, emotionally driven. But those emotions are a never ending roller coaster ride, up and down the hormone hills. They insist you anticipate their desires, but their desires can go from "Let's do something!" to "I need some space" in a New York minute.
Just be glad you get to fuck one every now and then.