How come girls never smile at me when I catch them looking?

Anonymous
I always hear about how if a girl gets caught staring at a guy she'll kind of smile slightly and then look down at the ground. I don't know if you're waiting for me to smile first, but sometimes I'll look up or I'll turn around and I'll notice a girl looking at me and I'll kind of just hold eye contact with her. How come you never smile? I guess I need to smile first but you guys never change your facial expression it's just a normal facial expression when we make eye contact, well more like a curious expression. So do I need to sort of smile a little bit like right before I break eye contact and see if you return the favor?
Updates
+1 y
I can't believe I messed this up for so long. All the missed opportunities!

Updates
+1 y
i'm assuming if they're aren't interested then they will probably just look away without smiling at all right?
How come girls never smile at me when I catch them looking?
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