Some helpful info below, but do also note that if the loan type is FHA, then the non-borrowing spouse's debt will still be factored into the approval even if that person will not go on the loan and/or title of the home. Again, this is due to CA being a community property state.
Best of luck and let me know if I can help.
The property will become community property again if ANY community funds are used to maintain it or improve it so it is very important that all costs be born by and come from the sole and seperate owner.
As mentioned by Claudia, California is a community property state. Because of this, the need to establish rightful and legal separation is a must. You will have to consult a knowledgeable real estate attorney. I suggest Bill Jensen: http://aries.brokerriskmanagement.com/_wsn/page3.html Bill is highly regarded in the industry and will serve you well.
His contact info is:
Leslie Walsh assists Bill and is a lovely woman.