please help

I know this question has already been asked (I know because i gave an answer to it) but i find it impossible to follow my own advice.
So i have this guy friend who i'm in love with. He knows that i like him and as far as i knew he was fine with it (him and my best girl friend are together)

but the other day i was talking to him over google buzz and i said something as a joke (i put a smiley next to it to show it was a joke) and was just like SHUT UP and stopped following me on buzz.

i'm really confused. we were really good friends and i'm not sure what happened