clear or not clear is better ?

after watched a movie at PPS by yesterday night...
this thought just keep bugging me at my mind.
is it really important to make it clear that she is your friend or more than a friend ?
is it after getting into best friend condition , the relationship can't go any further ?
or is it need to make it very clear that she is more than a friend to me ?
but all these doesn't help me anymore for now...
as...
1 thing for sure...
i had not make that clear.
end up the relationship become a friend, and i miss that chance about 2 years ago ?
or is it i did not even try to appreciate the chance / opportunity given to me ?
i just let it go ?
but for the second thing that i am sure that is
if there is chance in future , i will grab it and never let it go anymore...
as i doesn't wan to waste a opportunity anymore.
choose between friend ? further relationship ? best friend ???

ps : currently listening to
GDragon - Heartbreaker
T.T