Littlebird,
I have been where you are. But my ex was not a jw, just an ass. Your ex would like nothing better than to see you grovel, see you sweat, see you struggle so he can gloat. It's a power trip.
Your sons will see too the freedom and peace life has without that awful stress. They will back you, protect you and be more help than you can imagine as they get older.
Living on your own is great! I have done it and LOVED every new moment that approached, knowing I was in full control.
Be leary of him cooling off and trying to renegotiate friendship with you. Never trust someone who once tried to make you less than you are.
Another thing...watch that he doesn't somehow try to sabbotage your job or your friendships. Just sayin'. I want the best for you now that you are free and can think straight!