What are signs that a guy is flirting with you?

Is it always obvious, like this guy I once loved; Ben, who sang to me at dinner, touched my shoulder and pressed his leg against mine at the movies? Or Alex, a friend who keeps looking at me a certain way, gazing, or is it sometimes more subtle than that? If it is, what are other kinds of signs a guy is into you?

What are signs that a guy is flirting with you?
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