It's a tough one! think this is a
very common problem faced by a lot of people. You are not alone.
Well, go with your sentiments. But I feel that as a human being,
one should not regret. So perhaps would be better if you could pop
the question or hint to her, so that you know at least you've tried
and know the answer to your burning question.
But before you go and pop the question to her, you should have come
up with a few 'if' situations. If she agree, what are you going to
do and how to handle the current situation? On the other hand, if
she rejects, can you both treat each other the same way as before
and carry on with this platonic relationship? Do some homework with
your heart. And listen to what has it got to say to you and
act.
Good Luck!
lavender_scent