Is this bad sign?

Is it a bad sign if a guy sees you smiles and waves comes over to you asking what you have been upto? Staring into your eyes then asking about your friend and leaving after that to continue whatever they were doing?

They didn't glance at your body once or look in your direction much and when you were saying goodbye they had a smile on their face?

I'm guessing this guy isn't interested in me?
Is this bad sign?
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