You can bring a court action to either split up, or, more likely, force the sale or buyout of the property. The problem with a buyout in these cases is that often times one party has trouble getting financing on their own. If that is the case, it will be hard to get the other party off of the mortgage. A sale can also present difficulties if there isn't any equity in the property, or if the equity is small enough that you won't be able to absorb the costs involved in selling. If it isn't too late, you might benefit from putting an agreement in writing in case something goes wrong. This may or may not be a good idea depending on whether you want to argue over who sleeps on the couch.
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