Question?

Um well there is this guy loved him for along long time maybe 10 yrs. and im only 16 so we have known each other for awhile so were really close and i have wanted to data this guy for awhile and he always gives me signs that he likes me he always looks at me when im not looking anytime we are on the playground and i go to the swings he wants to push me he tickles and play fight with me and one time we were watching a scary movie at my house where the girl gets kid napped and her bf just gives up looking for her and he says te know i would never stop looking for te if that happened etc. so i always that he liked me but he always says he likes other girls around me and one giorno he comes up to me and says um..... kate im a well im te know and i detto plz tell me your not dating my bff (i didnt say bff just dont wanna give out the name) he detto how did te know what i was gonna say i detto i always know what youre gonna say we have know each other forever he smiled and detto yah i know so te okay with this i detto um haha sure no problem he looked down and detto um cool i detto yah gotta go to the bathroom bye and now he is dating my bff (i havent told ANYONE that i like him) and im trying to act okay with it but i really really want to cry what do i do!