I wouldn't risk on my friendship to tell it - but if you are sure that she will understand, then go tell:]
do you have feelings for her because she has been there for you as your support? is she a crutch or is she someone who will walk alongside you in the long run? ...just some thoughts, if anything just say it but prepare yourself for anything.
I think if it was going to happen, it would have already (as in becoming more than best friends). You could go ahead and tell her, but you might be risking your friendship...
Then ask her what she thinks of you guys becoming romantic...get her thoughts on it before you share yours.
look very simple awnser this is so obvious to figure out if she hasnt done anything to you but be afriend you no if someone likes you like that they show signs of affection in some way if not keep it as friends
I bet she already knows.
how would she no ilike to pretent people dont no what you think they no