This is true, I've seen this happen to friends. Sad but true.

Damn, and I thought you were refering to Sweeney Todd...

Anyway, about your friend. Tell this person how you feel-- not suddenly and not too discreetly or else this person will get the wrong idea.

What would make a cute scenario I can imagine from a film... One day she gets really upset and you somehow sweep her off her feet and make life a trillion times better... awwh ♥

I'm afraid you've been in that friendship phase for too long. If you confess your feelings to her, you're only going to create a rift between you and her.

Whenever I meet a girl who I'm really attracted to, I'll usually make a move within the first 3 dates. Otherwise, I risk entering that friendship zone. This is especially true when dealing with Japanese girls. They rarely reveal their cards so it's up to you to take that initiative.