Dear one,
What is a best friend for? Surely you’d love your best friend to trust you and feel the deepest connection with you by sharing such important matter in life? I feel your best friend would be more likely honoured if you talk to him about this. In any event, what could be the worst thing to happen if you do tell him? Maybe you can also tell him that you have been withdrawing from him as you did not want to bring him down…
On the other hand, I’m not sure what kind of expectations you may have by talking to your best friend about this. It may be helpful to just share everything as best friends do. This way, your best friend would appreciate the kind of trust you have in him while not feel pressured or anything; and you may feel a kind of comfort or support and not alone in all this…
Also, you know it is okay to allow yourself to be human and not try so hard to hide your feelings from the people around you…
The other thing is to realize that there is always only “this moment”. The future will be experienced as “this moment” when it comes. In each of “this moment”, there is only the situation to be dealt with or simply accepted as is…
Lots of love and sincerely wish you well!