Men and women are different. They have different qualities as a person, both in physical and personalities. This question also goes for women who don't understand men, especially their men partners. Maybe it's a question we cannot answer because it's supposed to be that way. We just have to understand the reason behind every action our partner does.
Of course, we must understand why a man or woman somehow acts. This is understanding between people. And if we still learn to give in - then a good relationship is guaranteed to us))