Im in love with my platonic best friend. can anyone give some advice?

i have been friends with my bestie for 3 years now and i used to like him b4 we became friends and a little bit into the friendship as well. then i went this long period of time as thinking of him a s a bro..well the feelings are back and this time its not a crush..its the real deal. i have 3 yrs of my life spending everyday with him so y wouldn't feelings *** along right? well i told him how i was feeling not to long ago and he said its not gonna change us..so i said cool cuz that's what i was manly worried about was our friendship bein awkward..i even told him that he was in a couple of my dreams and that i loved him way more than a friend and all he said was "thanks"..then he got a girlfriend..which made me feel bad becuz he knew i liked him so he didn't tell me about her which hurt me because im a best friend b4 all..well he fell in love wit her and she broke his heart..and once again i was there to do damage control..he told me that he loved me as a best friend and ually but not as a girlfriend..with that said, i still don't understand y i fell like there can still b more..like he doesn't want to treat me like just another relationship so he doesn't want to give us a try..he has never gave me a reason 4 that..sorry this is so long but this is the edited version, but can anyone help me?? n plz don't b mean about it..thanks