Does making a girl jealous work?

This girl acts like she likes me in class and always comes and talks to me and laughs at everything I say. I asked her out twice and both times she said she couldnt make it. I want to write her off but she keeps approaching me to chat and looks all happy.

Im thinking of flirting with some other girls in class to see how she reacts. I figure then I will know.
Does making a girl jealous work?
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