My ex won't accept that things are over between us completely, it's like he can't hear it no matter how clear I've been.
I bet being served divorce papers would force him to realize differently.
What is his position with custody of the 1 year old? As I think you are moving a considerable distance away, will your 'ex' expect shared custody?
With regard to the rental house, as mentioned, I doubt there is any legal requirement within your lease that requires you must be a practising JW. You agreed to a place to live in exchange for rent payments. If the owners have a problem with you no longer attending meetings, then let them break the lease, freeing you to find another place.
Alternately, you likely could find someone else to sublet the house, thereby freeing you to move elsewhere.