What does it mean when girl keeps looking at you, when she is talking to a another guy in front of you?

Last night I was out at a club, whilst I was sitting down, i happen to notices a pretty girl near that kept looking at me like every two second the only problem is she was constantly talking to another guy. What do you think this could’ve mean?
What does it mean when girl keeps looking at you, when she is talking to a another guy in front of you?
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