Any relationship breakdown is going to hurt like hell. Not knowing your age, i suspect you are possibly in teens and if so, you need to learn how to handle these things because more likely than not it will happen again with someone else for different reasons.
Yeah it hurts that this one is so messed up. THAT is the warning sign. All relationships have warning signs that they are about to end or should have ended, we just don't seem to pay attention to them.
I think you are going to continue to obsess about this girl, i for one do get it. I was with a woman for the better part of one year, she was crazy but i loved her. I ended it to save my sanity and yet i still pined for her another two years on and off.
You have a choice, to get over it and move on, or chase her. One will heal you, the other destroy you. Your choice, you are not without hope and not helpless either.
You already know the answer, hence the title of your thread ''another sad non jw''....
You need to forget this girl, move on. There cannot be a compromise. You cannot join her religion for her and she cannot leave it for you. Wrong timing, not meant to be, whatever works, but RUN like it or not dude. She is messed up and messing you up as well.
oz