Sue,
What is your ex coming over to visit for? If you are trying to heal your wounds it would almost be impossible if he keeps coming to visit to reopen them again. I feel for you. It sounds like you are trying to pick up the pieces and move on but he hasn't got to that point yet. I acknowledge that it must be hard on him too but your healing has to start with you. He created his own situation and if it is not to his liking then he is the only one that can fix that. It is hardest for women I think, as we tend because of our nature to want to help people.
As for not settling the debts.........why would he? It is one way of tying you to him and holding you back from healing. If he was keen to heal himself and 'move on' then he would get off his butt and do just that. Perhaps it frightens him to see you courageously battling on when he is just not willing to. What he is saying to you is at odds with his actions. Anyhow, is there a way of doing some sort of debt consolidation that makes him legally take responsibility for his part of the debts? Or would it be better for you to consolidate the debts pay out what you can and move on?
I am sorry to be so blunt but really blunt is the only thing that works with most people and PTSD.