Agree.
Agree.
It is usually inevitable that such would happen. I have a very
good girl-friend myself, and 2 times i had very big crushes on her.
On my side, i simply tried my best to conceal my feelings for her
loh, because i only want to keep the relationship platonic.
Afterall, i perceive both of us to be extremely incompatible by
romance but very good as friends. Besides, loving someone, to me,
doesn't mean that i have to necessarily possess her, so long as
she's fine and happy, that's good enough for me.
So i am saying that maintaining such a friendship is
possible, only that it is very difficult
(especially when the your friend is very chio/yandao). 
Cheers