What is my relationship with my best friend?

I have been best friends with this kid for forever he is 18 and im 17 and I would do anything for him even die for him withouth question as would he. Heres the thing, we both have had with girls and other ual experiences with girls and openly talk about this stuff all the time. But for over six years we have talked on the phone everynight we dont seem to mind being naked in front of eachother, we mess around like wrestling all the time and are always playing around acting like we want to do stuff with eachother we have jacked off together...and we both enjoy it. I have never been attracted to a guy before EVER but think i might be to him and I know he doesnt mind how we act its just I dont know if this means we might be bi? we have almost kissed before and we are constantly hangin out, and i think sometimes we use being drunk as an excuse to rub on eachother in a ual way.I really love this kid he means the world to me like a brother but what is our relationship?wat do ido