After the big build up drama of, "I have something to tell you, I hope we can still be friends, blah, blah........" She'll probably say, "And you think I didn't know?"
Just do it. It's no big deal and there's such a wonderful afterglow when you've shared with an accepting confidant. Then you both have a secret! But, be careful. There will be an impulse to
try to experience that euphoria again. Use discretion.