Why hurt me so?................?

I saw the guy I love (we are friends with feelings for each other) today.He saw me coming and started talking with this other girl extremely flirty and ignored me when I said hello.So did she.This other friend of theirs came down the corridor and said hello but almost hissed it.All three ignored me.He is not 'into'any of these two.Why did he do that to me?He has done this after a week of staring at me with tears in his eyes? also the two girls hate me, so is he taking sides?