I am confused and I overthinking and overanalyzing...

I don't know how to explain exactly what I am feeling... the bottom line is that I am afraid that I will loose an important person from my life... and nowadays it's a constant stress... I have a very good friend, that we spent most of our free time together, we go on vacation together, we talk about me, him, our hopes and wishes for the future, he sometimes talks about things that he wants in his life partner. and for the last few months i want to be more with him... we have reached a point were most of our common friends think that we are together. But when someone asks us, he decalres that we are just friends... which is confusing and disspointing... Of cousrse I won't force him to be with me... and maybe the honest and fair thing for him would be to clearly talk to him about the situation, but since he is declaring that we are friends, from my side i don't see a point in explaining my feelngs... i don't know what to do... right now, i am not even sure what he is thinking... the only think that i feel is that i am loosing a good friend and i don't see a obvious solution...