How can I win my ex bf back?

ok this is a complicated story. we broke up right before summer becuz i didnt want 2 go out over summer. now, were bak @ skool and like 6 other grls like him. hes the flirty type, so idk who he likes. we flirt w/each other all the time and he alwasy talks 2 me wenever im alone. so plz hlp me figure out if he mite like me or how i can get him bak. thnx!