Well, my wife has set herself up in the basement as if it were a separate apartment. She took down everything she thinks of as hers (basically, anything significant which she has purchased since our marriage, despite all our finances being joint) and put out things that she doesn't want that are mine. One cat ("hers") lives in there with her, and the other one, which I owned when we got married, is forbidden from visiting "common areas" unless I'm there to supervise and clean after it. She can enforce this because I'm not home all day, working to pay the mortgage, while she hasn't had an outside job, or an income, in years.
Someone's being taken advantage of.