What are some ways to tell if a guy is flirting and not just trying to be nice?

Sometimes I am very blind to guys flirting with me and can’t tell until it’s too late. I can never tell if they’re just complimenting me/trying to be nice or actually trying to flirt, so I assume that they’re just being nice just to be safe.

What are some ways to tell if a guy is flirting and not just trying to be nice?
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