Was he interested in me

you ask if he's interested? sounds more like he might have been weirded out by your behaviour

No, he caught me checking him out which was why he responded that way. I didn't really do anything that was really weird. I'm can't be sure if hes interested in me though

Oh good heavens. He probably saw you "intensely staring" at him for 4 seconds (really? 4 seconds? How can you intensely stare ate someone for 4 seconds?) and so he checked you out, maybe even wondering if he knew you from somewhere.

Why oh why do so many people come here believing that simply being stared at for a few seconds must mean the person is interested. Heck, he may have simply like your hairstyle or the outfit you were wearing. Or maybe he wanted to make sure you were not some kind of weirdo for intensely staring at him for 4 seconds earlier.

But the answer to your question is no. If he had been, he would have come talked to you. He didn't. So he wasn't.

no. you do not know that is why he responded that way. just like you don't know if he was interested.

don't stare at people.

just don't.

You stared at him, he responded with a stare.

Good start, but what happened NEXT?

If nothing happened, then it was nothing.

Next time, SMILE and say HI if you want attention from a man.