This is embarassing....

There's this guy i really like but i dont know what to do! sometimes he'll act like he likes me back but other times he wont speak to me, and he's really confusing. Like, he started drum classes ONLY after i told him i did them and where, and he can be really sweet, but other times he can act like a dick :L he's also been out with really slutty girls, and he's kinda a manslag, but i cant help liking him!! what do i do???