women seem to take a guy who shows some potential and try to mould them into how they want the guy to be and get upset/angry when they guy resists or 'fails' them; guys tend to find a girl and just try to be happy with her, maybe overlook some of the things he finds out about her because he cares for her. Women seem to find something they don't like about a guy and fixate on it and create problems where there aren't any over it leading to what we call 'expectations'; the expectation for the guy/girl to be perfect. At the same time though, if there's something a woman really doesn't like about her partner, she has to right to ask him to change it or she can learn to live with it. This is when you see what people really mean to each other. If she means enough to the guy, he'll change it, if not then they were never meant to be together because they just weren't compatible. At the same time though, nobody's perfect and love is about overlooking (or not even seeing) those imperfections, it all comes down to whether or not you can learn to live with their imperfections or they'll change it for you, if not then maybe you're just not right for each other and it's time to move on.
This is only my humble experience, but then again; what do we have to learn from other than our own experiences?