As difficult a situation as this is for you, take a step back and boil this down to its most basic terms:
your done being a JW.
She isnt willing to carry on a relationship with you if you are not fully engaged as a dubbie.
That seems to be it in a nut shell. The fact is you cannot force her to meet you half way, which it seems like you are willing to do... its all or nothing with her. Its sad. Its wrong. But its reality. Pining away for her dosent change the basics.
There is only so much any of us can say on an internet forum to help, but for what its worth it seems you are willing to meet her halfway and attend her church with her. Shes being unreasonable and demanding you believe exactly as she does. It may be worth your time to seek counciling and get some professional help but whatever the case, i certainly wish you the best