What a good friend you are.
She may have reasons she hesitates with him, that you may not be aware of. She is wise to use caution, and proceed very slowly. Personally, I think that knowing him well for a year as a friend, it would be a natural progression to fall in love- if both parties are on the same wavelength.
At least she is likely comfortable enough with him to say she is unsure, and he sounds respectful enough toward her that he won't push it.
I hope that if she does decide to date him, she realizes that that transition from friend to boyfriend, may not ever go back to the way it was, should it not work out.
As I wish said, the ball is in her court now.
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