What does it mean when I catch a guy staring at me then he immediately looks away?

It means anything from he was admiring the light on your beautiful locks and he's madly in love with you, to the possibility he was staring randomly into the distance thinking about how much he was looking forward to the dinner he had waiting and only realised he was looking at you when you looked back.

As the above poster said, why do ask these questions? Hell, why do people even bother thinking about this stuff?

No. Unless he's done more than that. Please stop with these inane questions.

Edit: I'll add more. Even if he smiles at you for a second it might not mean anything, it is most likely a polite gesture. If he starts talking to you then yes he might be interested. If you're that keen on him try and have a chat with him then you'll know for sure.

I cover my hair lol 😭 and why would he look into my direction and think about dinner when he could possibly look anywhere else.

I'm procrastinating that's why.

I'm amazed that guys still look even though they have gfs

I'm not keen on him, he has gf anyway but I'm amazed that guys still look even though they have gfs

Do you not understand the concept of random?

I'm not keen on him, he has gf anyway but I'm amazed that guys still look even though they have gfs

WTF?! Like what the actual ****?! Do you think guys should just walk around with their eyes closed when they have a gf? Maybe a condition of marriage should be having them gouged out?

People like looking at things around them, whether they find them attractive, interesting, or just downright weird. It's not like he was staring up your skirt. And as previously mentioned, maybe he wasn't looking at you but just phased out staring randomly into the distance in your direction.

Lol even randomly, why would you look at someone and give them the wrong impression?

They can look, obviously no one can walk with their eyes closed. But there's a difference when a person stares at you, I was the only girl in the entire library. The chances of him being phased out in my direction is unlikely.

Because when you just zone out you're not looking at anything or anyone. Your eyes just have to be pointing somewhere. He likely didn't even notice until you looked at him.

Question is why did you look at him? I mean you know he has a gf; why do girls look at guys when they know they have a gf?

No, it's not. Is just as likely as him having any interest in you at all.

Even if he was looking at you it might have been because he was wondering what you were doing in the library at such an odd time, what item of food to had stuck to the side of you face or where you bought that fabulous headscarf...

The way you're refusing to say it was just a random occurrence makes it sound like you want him to be interested in you, so maybe be a bit less stubborn?

There's no point in asking a question if you're not going to listen to the answer.

Lots of times I find myself thinking about something or nothing and I suddenly realise I'm looking at someone. Does this have any underlying meaning? No. As others have already stated, this staring could be for a multitude of reasons.

How would you react if you looked at him staring at you and he kept staring? That would be very strange. So don't assume the reason he looked away is because you "caught him in the act" or something along those lines.