Wow. Sounds like you have entered no-man's land here dude.
The problem as I see it is that you both started this out with the understanding that it is simply casual. The only problem being that you really can not dictate what your emotions will do - even if you want to.
She is falling in love with what she sees as an attractive, fun and interesting guy. That is not such a bad thing.
You on the other hand have decided to take the stance that you will not enter a relationship for any reason.
Now we see the problem.
So ask yourself this: do you really want to avoid relationships? If the answer is no or any version thereof, why not just allow yourself to feel?
I am sure that this is not much help to you .. but I strongly believe that you have to allow yourself to feel things naturally. So that is my advice.
If you do NOT want to let yourself feel then let her know. The best course of action in this case is to remove yourself from her life to prevent hurting her.
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-- apt-get install spare_time --
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