Help, need some advice/tips/ or anything? =]?

Well, today in class there was this guy and his best friend and me and my best friend. We started this thing where, when we get bored we throw paper balls at each other. (p.s-- we don't like them, and they dont, either) So, they started so we threw back and stopped because we needed to pay attention in class. Then, he took off his sweater and my other friend, took it for fun. He was cool with it and started taking our stuff and we had his stuff. At the end of class, he asked for his stuff and so did we. We gave everything back to each other. Later on, my friend took his sweater.. He came at me, pissed and was like give it back. I told him, i don't have anything. He left, and never apoligizied for accusing me. =o I just want to know, even though, you might find this story silly, but like why is he getting so pissed all of a sudden.. Oh, and he teases me a lot, calls me names, and tries to be cool. Does he like me? I am juss curiHelp, need some advice/tips/ or anything? =]?
Did he come across like he liked you? I mean , someone who you thought was playing along with you like the others did all of a sudden is really angry and does not mind letting you know it , does that really seem like someone who likes you ? If you do then you are mars and he is from venus.