Help! I want to be best friends?

Ok so my best guy friend and I can talk on the phone for hours and we hang out all the time at lunch, school, and outside of school in groups, and I really want to be best friends with him! But, he is really good friends with our other friend! He always tells me how good of friends he is with her and how he's excited he can finally become her best friend next year with her current best friend out of the picture, and how he tells her everything! They talk on the phone too and hang out outside of school and on the bus. It makes me so frustrated, because I really want to be his best friend! Btw i am ALMOST POSITIVE they are friend zoned, because she discusses crushes with him and he doesnt seem to care who she likes. How can I become his best friend while he wants to become her best friend!?!?!?