When he's far away, he'll look at you without letting you know. If you quickly turn towards him, he will turn away quickly to prevent you from knowing that he was staring at you. Keep an eye on him and see if he does that.
When you are close to him, he may act "weird". If nobody else is talking to him, he will try to look "busy" (to hide his nervousness) by maybe playing with his cell-phone, playing with his watch, etc. Usually a shy guy will talk to everybody but you, to keep you from finding out that he likes you.
He may also try to be extra nice to people around you, like your friends and/or parents, etc. Shy guys do this because they believe that if he seems like a nice enough guy, the girl he likes may feel comfortable around him and talk to him. Keep an eye out for this behavior as well.
I'd say that if you notice those things mentioned above, you should try to talk to him. Don't ask yes/no questions, but instead ask questions that will require him to explain things. Like for example if you think he's good with computers, ask him how to remove a virus from your computer, etc. That way you will get him talking about something he's passionate about and he'll get so carried away that he'll forget about acting shy.
I know these things to be true because I am a shy guy myself, and I do the things that I mentioned when I am near the girl I like. If a guy is shy, he's waiting for the girl he likes to say something or ask something to him that will open his doors to step out of the shy behavior. Hope this was helpful. Good luck!
if he looks at u like theres no tomrowe and 4ever then u know he likes u or he like ur boobs and want u 4 ur boady idk figuer it out but u'll kno if he really never looks in ur eye but at ur boady hope this helped and rember there are other fish in the sea.
if he always smiles at you or if jokes around about you being shy. that usually means he likes you!
When they know that the guy likes her.
Look into his eyes and have a conversation.
You'll know if he likes you if his dick goes hard when you bend over..
dont be shy and ask him if he likes you?
sometimes when a guy is shy to talk to you it might be because he likes u or just wants to be friends but don't know how to.
he wont blush around you or be shy around you.
If he blushes and stutters when you go near him.
it depends on what that guy likes.
Get someone to go up for you to talk to him,or send a note to him.
he gets shy when he looks at you he goes a bit red he secretly looks at you
Well the guy shuld try to talk to her