Simple answer: because women are people too and romance stories (whether for men or women) tend to simplify what love is really like.
Long answer: Because the famous comedy routines that portray women as mysterious and complex, and men as simpletons with only sex on their mind, may be funny but they are gross oversimplifications. Women are fickle just as men are fickle, if you go into a relationship expecting a certain thing your probably going to find it, it's called confirmation bias. Go into any female dominated dating forum or site and you will see women complaining about men doing the same thing. People in general tend to be fickle and even when we think we are the ones being all laid-back and simple, that may not be how others perceive us.
So basically, love is a case by case kind of thing, women are fickle, complex, simple, compliant, defiant, willful, passive, emotional, stoic, and everything in between. They are struggling with changing gender roles in modern society and trying to find their place in a world that use to have men telling them what it was. Men have the same problem, gender roles are changing for them too and they find themselves in a society that seems to be uncertain what masculinity means and what is expected of them anymore. But then again society has often been in a state of upheaval so in some respects it's all working as intended, besides I personally would find the whole thing boring if we didn't mix it up every now and again.
Long answer: Because the famous comedy routines that portray women as mysterious and complex, and men as simpletons with only sex on their mind, may be funny but they are gross oversimplifications. Women are fickle just as men are fickle, if you go into a relationship expecting a certain thing your probably going to find it, it's called confirmation bias. Go into any female dominated dating forum or site and you will see women complaining about men doing the same thing. People in general tend to be fickle and even when we think we are the ones being all laid-back and simple, that may not be how others perceive us.
So basically, love is a case by case kind of thing, women are fickle, complex, simple, compliant, defiant, willful, passive, emotional, stoic, and everything in between. They are struggling with changing gender roles in modern society and trying to find their place in a world that use to have men telling them what it was. Men have the same problem, gender roles are changing for them too and they find themselves in a society that seems to be uncertain what masculinity means and what is expected of them anymore. But then again society has often been in a state of upheaval so in some respects it's all working as intended, besides I personally would find the whole thing boring if we didn't mix it up every now and again.