Generalizing men and women isn't right, but still most women work on emotions and men work on logics. While the logics will always be the same, emotions changes according to time . Scientifically, the changes in a women's body is more complex than a man's . This includes the hormonal changes, leading to mood swings. Women are more expressive in showing love, but not concrete desires. They wants you to do something without even saying, alluding or giving out hints. These small things makes men confuse .
Men use logic and try to be neutral which is not what women want, and that's how these phrases like “men will be men” and “ no one can understand women” came about. If a man wants to understand what and how women feel, he can learn a tiny bit about human psychology. When he does, he'll discover that all humans, male and female, have similar core psychologies. There are differences between male and female brains, but they're way more alike than they're different. Just like men, women feel joy, sadness, lust, jealously, fear, disgust, pain, loneliness, etc. In general, they even feel those feelings in the same situations men do.