How can i tell if he lyks me.????PLZ HELP.....!!!!!!!(further details r given)?

THERZ DIS GUY I MET....HEZ REALLY CUTE.....HE WAZ LOOKIN AT ME MANY TYMS........BUT HE ALSO STARTED MIXIN AROUND WITH MA LIL SIS LATER ON...IM JUST TOO JEALOUS N I REALLY LYK HIM.....HE WAZ LOOKIN AT ME EVN WEN HE WAS WIT MA SIS....I DONT KNOW WATS IN HIS MYND...PLZ HELP ME..