When a girl looks at you, smile back and check your own body language for confidence and openness. Then watch for multiple signals in her body language, not just a smile, since attraction shows up across different physical cues.
The third thing to do— so number one was smile, number two is to do a quick little mental body language scan of yourself to make sure you're confident and open and friendly. The third thing is to do a quick scan of her body language. The truth is, a girl smiling at you can in fact be a very good sign she's attracted to you. But you never want to act if you only see one sign that she's interested in you. As humans, what we're feeling is visible in our bodies. You know, if somebody's nervous, if somebody's angry, if somebody's sad, if somebody's scared, somebody's happy, we can see it in their bodies. The same is true with attraction, and it's actually a very good tool to have to be able to tell when somebody is attracted to you.
