How come he doesn’t smile at me anymore, how can I give him a clear sign I’m interested?

So this guy kept staring at me all the time and I thought he was cute, i felt him staring and I looked over and he was smiling at me but me being an idiot and getting self conscious i just made eye contact then broke it off without smiling back. I seen him after this twice and both times he just looked at me then put his head down. Is it worth next time maybe approaching him in a simple way, asking him where something is or what the time is and smile so he gets the message?
How come he doesn’t smile at me anymore, how can I give him a clear sign I’m interested?
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