I think my best friend doesn't care about me anymore ? :(?

Well, I'm 15 years old and so is my friend. I just don't feel good with my best friend I really care about him and he did before I think at least. I mean like at school we are always together, btw it's not been long time that we are friends it like 1 year and a half but like in school we are ALWAYS together and we always joke with each other and all. But when I talk to him on Yahoo Messenger sometimes he really hurts me. Once I was joking and said something it wasn't something wrong I asked him something then he answer I said Why and I joked and I added Anne, Why ? IN Robert Downey jr speech when he represents the actresses for best bla bla bal..... and then he said why do you do that ? suddenly he said "you do it when we suddenly speak? pfff" and like stopped talking to me I had some family problems I was trying to cheer my self up soo :) and then he I said "I'm sorry, I won't do it again" and he answered "lol" and I was soo angry for that I mean I said I'm sorry and he answers LOL I told him that it wasn't funny do say lol. I then apologized from him and I said my stupidity, I'm stupid he said "nooooo :@ you are not" and said "why are you saying sorry you did nothiing" and once before he really hurted me he told me "why are you trying to be better than me" though I wasn't cuz we usually have the same grades and we are both intelligent, I answered him "I'm not" I was really sad to see my BEST FRIEND saying that to me but then next day (it was holidays ) he sent me a message and said "are you mad at me, if you are you're totally right" I don't get it. I mean he is sooooooooo nice and great guy but sometimes he really hurts me and then apologizes but always it's me who apologizes I don't know why. I don't even make stupid things I mean he gets mad for some little things. In school teacher said to him "come see me at the end" in sports and he said to me "wait for me please don't go" I said sure cuz I really care about him. And like he always is with me one day we had an information day (about driving car and motors ) first hour we weren't together cuz we didn't enter together second hour he said "come we should sit side by side I don't wanna be far from you" and soo we did. But what I don't get is like sometimes he goes with others when we are in break and doesn't care about me (the guy is my friend too the one who talks too) I mean he is a good guy though ( the other friend ) but I don't get how my friend is soo ? some help please. I said I'm just trying to help you with ur gf stuff and he said don't I'm good I said sorry ok Im not going to. then he said sorry and don't know what although he is always nice in school and wants to be with me always. We are always side by side in classes ( not in Scienes ) lol I just wanna know your opinion even though what I said is not really clear but I'm in france by the way and I'm not English or american I'm french :) lol I just want some help or somebody is in the same situation just tell me what to do ? should I talk to him about the subject that he hurts me ? or do what PLEASE HELP MEEE, thanks for your time :)