Most cultures brainwash people into believing that nothing should come easy, including forming relationships with other people, whether on the friendship or relationship level. Since we live in a culture where facades are considered cooler than directness, yes many times means no, and vice versa.
It has been my experience that both sexes do this, so I would recommend avoiding guys who are addicted to the chase, since they tend to be more egocentric than their more down-to-earth adversaries. You did your end, so if the guy can’t return the favor than he’s either an immature egocentric screwball, or he’s simply not into you. He could also be very love shy. More times than not the reasons are usually the latter two reasons though from my experience. Unfortunately (or maybe fortunately) not all guys or girls are the same, though many try to proclaim they are.