I think you should .
Gather all yhour courage and ask him one last time . Like
seriously sit down with him and talk about it .
If he still like act blur and all then it`s time you move on and
just take him as your friend . After all 10 years of friendship
hard to come by .
It`s gonna be hard to move on but trust me when u have finally
got over him , your life would be much better . Cause u didnt lose
a friend and at least you wont regreat not tell him your true
feelings .