Should I tell him?!?!?!?

So i really still like my ex boyfriend and well him and i flirt alot... like ill see him at the skate park and my friends kinda watch to see if he looks at me or when he trys to get my attention and he DOES ALOOOTTT!!!!!!! lol but i dont know if i should tell him tommmorow that i still like him becuase sometimes he acts like he just doesnt care, but yeaterday i was hanging with a bunch of friends and my best friend said when i hugged another guy he would look over and give a little glare... but like i dont knwo still... like when i was aout to leave yesterday he was like "oh gosh i cant believe you are leaveing right now" but on myspace(i know how stupid im bringing it up ut he has another girl on it as his number 18 out of 20 all the rest are boys} BUT PLEASE TELL WHEN WHAT I SHOULD DO... im really scared ofif he likes me or not.. can someone inurpret thiss??