What did i do??

its really starting to get to me...this boy who really was into me im not sure if he likes me anymore. I defitnitley like him. and i miss the things he used to do and say to me. he asked me to be his gf in fornt of everyone, but i totally ignored him and probably embred him. all of a sudden he stopped. i dont know if he doesnt think i like him b/c my friend and i were talking about boys we used to like and i guess he overheard. after that he startin tryin to make me jealous and is kinda ignoring me. he said hi to me today though. im kinda shy only around him, how can i show him i do wanna go out w/ him