It’s a woman’s job to resist your advances. It’s your job (the man’s) to try to break through that shit. You even see that daily in the animal kingdom: the feline resists the male cat by hiding and fighting. The mare horse (female) kicks, bites and runs from the stallion [so as donkeys]. The bitch puts up resistance against the male dog.
This is seen all throughout the animal kingdom. Humans, as advanced beings (mammals), we exhibit the same behaviors as other animals. Hence, the female resists us, she runs from us (physically and otherwise), she fights our advances and she does whatever she can to ward off potential mates (males).
With that understanding, it behooves the shit out of me why men seem to think that a woman playing hard to get is a sign of disinterest. SHE HAS TO PLAY HARD-TO-GET! IT’S IN HER GENDER ROLE AND HER NATURE!
Once you understand that a woman has to resist, you either adapt and tweak your approach (via Game, etc.), or you continue to bitch and complain about women being difficult to get.