The short version is that, in the absence of court orders, either party can do anything they want, with their property, and with their children.
In reality, if the wife did file for temporary orders, given that the husband has been living (somehow) out of the home for half a year, it is more likely than not that the court woiuld consider that the "status quo" and attempt to maintain it.
Bottom line is that he has to pick what he wants to do -- negotiate, mediate, litigate -- he is in limbo, and must make a decision as to how he wants to live and then put into place a plan for making that happen. No one can be foreced to remain married in the modern world, but it soiund sa if it is time for the husband to make this a time of decision for the wife, and choose -- one way or the other -- how to live in the futre. Before he does so, he shold have a full consultation with expert family law counsel, to get as good an understanding of his options, and the legal probabilities of upon divorce, before suggesting any of them to the wife.
Answered on Jun 02nd, 2013 at 2:56 PM