How can you tell if he really likes me?

well.i go to d same school as him.hes cute,hes handsome,he abit dumb,he's older than me.he..he has a girlfriend.but i tink they dont look good together.seriouly.i dun tink they talk to each other much.to what i know.d girlfriend is timing him.but its not for sure.ok.back to this guy.i never really talk to him.unless text messagin n im'ing counts.i did hav eye contact couple of times.well yesterdae his girl found out bout me.she confranted me.im so sorry. but i still like him. !ok.anyways.im not quite sure if he likes me..ok yerterdae he wanted to tell me sumting .but he changed his mind.he said he will tel me when d time is right? < did it mean aniting?usuali if he is wif his fren n im wif mine.. we would jus do eye contact .is tat a sign tat he liks me?.aniwaes im abit shy.how do make an impresion tat i like him? what r d signs 2 show that a guy do liks you? can you make them like you? inmy case,do he like me?not gona steal him away but it looks lik his not reali in2 his girl..i tink