I'm in Ontario Canada and my ex wife, who now resides in an apartment of her own, has decided that since things aren't moving fast enough for her... she's moving back in. She has been out of the house for at least 6 months and 99.9% of her belongings have been moved to her apartment. The title on the house shows my name only as well.

Does anyone know what I can do to protect myself? What course of action should I take?

This is just another thing in a long list of reasons our marriage is over. Any help would be greatly appreciated.