Ok, so like, there's this guy I kinda like, though I don't really know why expect for the fact that he gives me attention. (Or did)

so I started flirting with him back, but he was going out with my friend (lets call her B). He flirted with me, but stopped when he figured out I like him.
we went to this club-thing together and somebody snitched and told we kissed when we really didn't, so now B is mad at me. I have no idea what to do, because when she's not around he flirts, very little though, and I sorta flirt back. I've never liked a guy like this much before. And, he likes my other friend (lets call her D). He tells me he doesn't like her and I don't know which one's lying but D says that he flirts with her seriously. I got kinda jealous, and started to do more flirting.   This guy I know said that (and I GUESS they are friends) he really likes me. Though, he doesn't act like it and he also said that the guy I like, likes me more than D. But, he shows her a lot more attention, flirts with other random girls, and sometimes acts like he likes me but when i try to flirt with him, he acts like he doesn't like me.
Sometimes, like on the phone he acts like a total and complete jerk and I just want to slap him. But other times, randomly, he's really sweet and nice and likes me and stuff. I have no idea what to do! Plus I'm jealous that D gets more attention than me (I know that sounds bratty) and I guess, all the other guys that used to like me, and flirt with me went to D and flirted with her. And likes her better even though she's not that pretty and brags and crap.
OMG I NEED HELP SERIOUSLY