The only boy i have ever loved (also my bestfriend) Hates me now for no reason.What should i do? :/ Please help!

Right, so this boy joined my primary school in year 5 and i straight away fell inlove with him! Whenever he entered the room or touched me, my heart skipped a beat and i found it harder to breathe (that might sound quite stupid but it's true!) We had a connection and we always spoke about things, and the more we spoke the closer we became. After a while he started telling me really personal things that noone else knew. We were both in the same group of BFFL's and we became best-friends. I secrety loved him for about 6-7 years (as i am in YR 11 now), but never knew if i should tell him or not. When i moved to high-school we met after school to go to town every day and we were constantly texting eachover.A while ago i finnaly got the courage to tell him so i met him after school, but something awfull happened. I saw him kissing one of my best-friends. (who was also in our group) I didn't want to be a bad friend and break them up so i decided to try and avoid him. It was IMPOSSIBLE! A few weeks later he started talking to me on MSN, i didn't ignore him obv, but we weren't talking as 'personal' as usual. Then suddenly he wrote back "Get a life lez, loving me you prick!"and then he logged off. It might sound pathetic of me but i was devestated!!! I can't stop thinking about him, and i cried for the first time in my life! Whenever i see him my heart still skips a beat but i just smile at him and act like nothing ever happened. He always ignores me and gives me a bitchy-look. I don't know what i did, what should i do! Thanks so much, sorry about the long comment. BTW, i still love him and think about him all the time!