It is normal to have feelings of doubt and wondering if you are really doing the right thing, that it was not so bad, etc.
Eventhough I have never been a JW, I was in an abusive marriage (not now). When I first left my abusive spouse, after a period of time I had similar feelings that you are now experiencing, I returned to him.
Try to examine your feelings, what are you feeling, and why?
Remember back when you first started thinking about becoming inactive, what caused your doubts about staying with the JW's?
What event(s) finally caused you to become inactive?
Think about those reasons before considering returning.