Flash of inspiration; hope it doesn't disappoint.
Once upon a time there was a boy, who was in love with a girl, who was totally clueless.
She was smart, she was funny, she was beautiful.
And she had no idea she was any of that.
But one day – he isn't sure when, or why, or how – one day she got a glimmer of an idea.
And that day she got a clue.