You know why? Because guys always think if they go for the girl
and rush too fast, the girl gets scared. They never look at the
reality, which is the girl's feelings are more important. If the
girl doesn't like you, it's very hard. The guys look at their own
high feelings and because of that they think the girl likes them.
And then when the girl doesn't reciprocate, they think there's
something wrong they do, when in truth, the girl has no feelings
for him at all.
Cheers