Well, I don't know the initial story. Starting out as friends is good though. Saying "You're such a good friend" doesn't always mean that's all you'll ever be. Keep a positive attitude, but also don't get your hopes up, keep it at a good medium. I've seen some girls fall for their best friend or good friend after a long time, something in them clicks, and it makes them realize, "wow I like this guy". Girls are complicated, no doubt about it, some are more complicated than others though.
Good luck and keep us posted!