Poor guy!! Another one! These jw girls seem to just want to play games. Get a guy to fall in love with her, get the guilt trips then dump him.
I would say run away if you can but you've asked us not to say that. So alternatives? Her brother is a faded JW, means he doesn't want it anymore and is cool with you. Could you get in touch with him, get him on side? Maybe he could help you?