Wat this sign when a boy does this?????????

can u tell when someone like u without speakin jus by they action??? He used to stare into my eyes turns his head when im looking, when he sees me talkin to other boys he seems upset he walks away. when i was leavin he got upset and wheneva i see him he turn his head away from me and i don't understand why is it becoz he dnt like me??????????????????????? i saw him he looked at me laugh and then when i looked at him he move his eyes up in and did not look at me,, ever since his been turning his head when i look at him like his avoiding me?