Im attracted to a woman that shops at my store and I think it’s mutual. how do I make sure she is interested or is it a bad idea all together?

She is always in a hurry but the last few times she takes her time looking around until I’m done With other customers so nobody is behind her. Almost seems like a green light? But she seems nervous too it doesn’t help.
Im attracted to a woman that shops at my store and I think it’s mutual. how do I make sure she is interested or is it a bad idea all together?
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