I caught him giving me side eye?

I was joining the queue for lunch. I had my back to my crush, as he was sitting at the table with his colleagues. I’m not sure if he was in mid conversation, but his head was turned slightly to the left.
I turned around to look at him (because sometimes it’s nice to just look at your crush hehe) and I caught him gazing at me out of the corner of his eye. So he was giving me like a sideways glance / side eye. He also had a little smirk on his face, which was already there when I looked at him. I turned around very quickly because I felt super flustered.

Why was he looking at me like that?

Also, a couple of weeks ago, I was walking round site and he was sat outside with his friends in the sunshine. I was wearing my sunglasses and I decided to stare at him as I walked past (he couldn’t see that I was staring at him) but he was staring at me for a few seconds. In fact, his friend sitting opposite him, ended up turning around to look at me lol

I caught him giving me side eye?
Post Opinion