well if you were married for a very short time, you might do better to seek an anullment and undo this relationship....maybe things happen for a reason and it was a mistake to go into marriage with so many loose ends and untold factors.
There may be other options for you, but you seem to think living with an Ex is your only way. If you do not care for her, this too is very dishonest...you are using her. time to figure out your life, wish you the best for some peace of mind.