i dont get..

why me and michael dont talk anymore, we havent hungout in like forever. and he never even text anymore. we totally drifted away from eachother it makes me really sad, cause i invite him to all my plans but he never even talks to me anymore. sometimes i feel like he uses me because i spend so much for him and doesnt seem like i get anything in return. im not asking for him to pay me back. but like understand that i do all these things for him cause hes my best friend. and it seems not enough for him? idk but i really hate it.