This is quite easily explainable. You must remember women come from a line of apes and chimpanzee's. In nature, the female species looks solely for one thing in a mate, dominance. The gorilla with the most power is the one who will provide for her the most. Food, shelter, protection, resources, etc all belong to the strongest. This in turn, equates to a higher chance of survival for her young. It is factthat female species, human or ape, is the more promiscuous. They cheat simply because there are so many more reasons, while males cheat only for sex.
So, my friend, you wonder why the girls dont go for your nerdy butt? It is because deep down, biologically, their genes are telling them you will not and cannot provide for her. You simply will get pushed around with your "nice" guy attitude. Mean while the @sshole or jerk, wins over so many, because he is the alpha-male. Yes, it is so sad. Men are the victims of society.