He likes me one day and her the next? Please read on and HELP!?

What does it mean wen a guy is rele flirty with u n u 2 are all over echotah n stuff den a few days later ur cuddlin n stuff (and also a nite r so ago he told his best mate he fancied u) ur mate goes n tells him u like him n he doesnt say anythin back and basicully doesnt say a word to u the rest of the nyt and flirts with her madly infront of u.. then u find out she likes him and he now has told his best mate he likes her instead?? what can I do? its really hurt me and ive been crying all night and morning over them. PLEASE HELP