@mcgree,
Your not married and there is nothing on paper. I highly suggest requesting a police officer to be their while the move is taking place.
This person stayed by you, with you by their choice and are not entitled to anything.
There is no written agreement or statement. What is yours is mine and what mine is yours.
Even if your married that is still your stuff and usually people have prenuptial agreements. Bottom-line it is not her stuff.
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You want to be cheap and avoid having a police officer stand by for any confrontation. You could do the move during an hour when nobody is around or is looking.
However make sure you take your belongings and nothing you purchased for her at all. That is another court argument right there. Just your stuff. In fact you might want to hire extras to show up early along with the movers to make the whole thing go by as quickly as possible.
Again if this is going to be a slow thing you might as well get an officer to make sure their is no confrontation. Problem is the officer might intervene and pose a threat against you which is another court date in the future.
Just get your stuff out ASAP when she is away from the place and do not take anything that you gave her or is hers. About gifts you gave her, it is okay to take back to those thing but otherwise is not advised. She might take you to court so I would read up that problem in itself.
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My aunt has tons of gold and diamonds from dates she went on, to guys and ex's buying her stuff over the years. Like a child she cashed it all in during the gold-craze.