It depends how you took title. If you took title to you and your girlfriend, without any more stated or as tenants in common or as joint tenants, then you could file a partition action to ask the court to order the property sold. You might or might not get what you want. If you took title to you and your girlfriend as joint tenants with full rights of survivorship, then no, you're out of luck.
You can file a lawsuit to "partition" your interests in the property in question. This may enable you to have all interests allocated to you. Both you and the girlfriend should be represented by different lawyers.
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