Why is it ok for a guy to chase a girl but not the other way around?

Why do people think only a guy has to do the chasing? If he doesn't then he's not interested?

So I want to know from the guys here, if a guy shows interest in the beginning continously and does the chasing, can the girl do the chasing after that?

Why is it ok for a guy to chase a girl but not the other way around?
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