Why would a guy give you an expressionless stare?

Anonymous
Even after you smiled at him?

I walked into a restaurant when I saw a guy at the counter waiting for his food. When he saw me he was staring at me, I decided to smile becasue it felt awkward. He didn't react to this he carried on staring at me without smiling back.

It was very strange, so guys why do think he did this?
Why would a guy give you an expressionless stare?
2 Opinion