Gadget, I commented on one of your posts a while ago on this situation. I'm glad you've been doing some thinking about this whole situation.
What's happening is you're still being controlled by the WTS - through your fiance. JWs are taught to love the Organization first, and then other humans. Your fiance loves the org much more than she loves you. If she had a true love for you, she wouldn't let the org or your disfellowshipping get in the way of her feelings for you. Unfortunately, she's allowing it to happen.
You're obviously being dragged down by all of this. You cannot base your happiness on one person, you have to base your happiness on yourself. Do what's right for you. Do what's going to make you happy IN THE LONG RUN. If your gut feeling is telling you that this is only doomed for destruction, then put an end to it.
It's a difficult thing to leave someone you care about, but doesn't care as much about you. Here's my recipe for a successful recovery:
1) Set a date to break up
2) Stick to your date, and do it.
3) Take a week and mope about it. Take a week off work if you need to. Work on convincing yourself that it's over.
4) Rebound. Find ANY available girl to date, even if she's ugly. This will help you get a sense of moving on.
5) Make some personal changes such as new clothes, new piercing, hairstyle, etc. Again, it gives you a sense of moving on.
6) Make a list of what you want and don't want in a woman.
7) Begin your journey finding this woman of your dreams. Date A LOT.
Memories fade with time. The quicker you get this over with, the quicker you can move on with your life.
Good luck, and glad to hear you moved out of your parents' house! It's great, isn't it?