The one piece of advice that I would recommend you look at is the "business" advice of your situation and that is to obtain some legal advice about your expenses, your home and what your rights are now. The thing about MLC is that they lie and are manipulative. I think you got a taste of that as he is questioning you on your expenses.
Personally, I would be asking for a support cheque rather than paying the credit cared bill - none of his bloody business what you are doing and you don't have to explain but whatever you decide, you should know your options and explore how the decisions you make while he is living with someone else can affect you later.
Obviously you do not have to tell him you have been to see a lawyer, but it is something you may want to think about.
