help!!!

this summer has been a roller coaster. one of my guy friends broke up with his girlfriend and started flirting with me. we aren't that close so it's not weird and i've always found him attractive. we have a lot sexual tension between us. but he flirts with other girls so idk what that means?? what does it mean if he always brings up girls around us or girls we both know to get be jealous, when we're in a group of friends he'll say something to me , walk away and say "come here" so i'll follow him, play fight with me all the time etc..

ALSO we have school starting up and i was wondering if you could give me tips for flirting in school? we can't really do all of the things we've been doing during the summer in school😂