Can someone please help me,

I have or had a best friend. And he was there for me through everything.Literally everything we’d talk daily for a year and a month straight. In april he developed feelings for me, and at first i didnt believe he loved me and then i did. Hes not the player type or anything. Well beautiful things were said hes the damn friend ive ever had. And i feel in love and he just lost feelings for me. Point is we’re just friends now well best friends and i feel like im loosing him and  i cant loose him because hes the only real friend i have and i cant stop crying and i dont know how to make myself feel better. And yes ive talked to him about it ore than once but nothing changes and i’ve never felt alone I CANT LOOSE HIM !!! Help me please