The man usually makes the first move. Even if she’s interested in you, the most she’s likely to do is to stand near you or make eye contact a couple times to encourage you to approach her. Read here
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Once you see her, don’t hesitate. 10 minutes from now she might not be there or another guy might have beaten you to the punch. Plus, women can tell when you’re working up the courage to approach. Shyness might be endearing in movies and romance novels, but it doesn’t work in the real world. Approach right away, even if you don’t know what you’re going to say