Guys, getting caught staring? What do you usually do?

Well, we all know that when a guy is staring at you for a little bit too long it's a good sign that he might be interested. What I've read on this site is that when you catch him staring he usually looks away. But does it mean when he smiles at you instead?

I noticed that a guy was staring at me when he thought I didn't see, so I looked over at him. He looked a bit panicked at first and seemed like he didn't know how to react, but he didn't look away. Instead, he just gave me a big smile.

Does that mean that he's more friendly than interested?
Guys, getting caught staring? What do you usually do?
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