Does he like me, and what should i do?

there's this guy, errol, who goes to my school. he used to be in my art class, and was always joking around to me. once we even had a chalk fight, and i think he was flirting cause he brushed his chalky fingers against my lips. i have a huge crush on him, but i think he might genuinely like me. once art class ended and he's in gym, he used to meet me by the same water fountain before 7th hour every day, but then he stopped. recently he started again, and we have a great time in the little time we have. my school lets 8th graders do murals on the walls during lunch time at the end of the year, and i askedhim to help. he said yes and smiled. tomorrow he is supposed to help me but here is the issue: he is kind of a ladies man. he goes thru a lot of girlfriends, like he's had 7 this year. thing is, he never cheats on them and seems to actually care about them a lot. after a breakup he is sad for a few days, then inexplicably gets a new gf in like a week. he's super nice and funny, so of course all the girls he asks out say yes. for him, i believe they don't always like him enough, so that explains all the gf's. but now he is back with his ex, this girl alexzandra from another school, who says things on facebook on his wall such as "yew are amazing. i wuldnt change anythinqq bout u." and yes, the spelling is also quoted from her. when they first broke up, she was a total b*tch to him, saying whoo! to every sad thing he posted on fb, even if it had nothing to do with her. so im supposed to be alone with errol tomorrow in a rarely used hallway for our mural, and the way he acts has this sort of aura that he likes me. and i so wanna kiss him, plus there's a formal dance coming up in early june, and we could go out. on the other hand, he has a gf, and that would ruin any potential relationship to start like that. he tends to date a girl for a couple days to a couple weeks, but i don't know what to do.and i really hope he knows i like him, which is why im using his name in the hopes he'll read this eventually. i just feel like i like him enough that we could last longer, and if not i'd have the memory of a sweet first bf. should i wait for the breakup and hope its not too late, or tell him how i feel? or flirt and hope for the best? i don't wanna screw this up. i have liked him for a few months but its like no other crush i've had cause this time i spend every day thinking about him, whenever im not with my friends, or sometimes even then. i dont care if we date for 1 week, i dont care about all his exes, i just want to experience this with the one guy i trust and understand. please help me!