I know exactly how you feel. I had a one year relationship with a JW woman which ended in January because she couldn't continue leading a double life. I was a secret the entire time. If you have questions, feel free to PM me. Being a Christian as you are, it may or may not shock you as to the general beliefs that differ from yours immensely. Christ being a created angel, not God and the twisting of Scripture to support their theology. No physical ressurection of the body. No birthdays, Christmas, Thanksgiving, holidays etc..
We still are having trouble breaking away from each other. We still keep in contact through emails/text messages. It's really been the most heart-breaking situation I've ever known. I thought I was going to marry this girl.
I suggest you read the posts on this site. They will really give you insight into JW beliefs and doctrines. Educate yourself as much as you can on everything. And like I said, if you need advice or anything from someone on the outside who was in your exact situation, let me know.