Did she get your boyfriend's information? She's going to have to have his name and address to file a warrant for assault. If she does do so, make sure he talks to a lawyer immediately and not to anyone else about the charges. A lawyer will be able to gather the witnesses necessary to defend the charge.
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It does not sound like anything has happened yet, and so likely nothing will. IF charges are brought, hire a criminal defense attorney at once. False report is a crime, and yes you can also file suit. You can consult a criminal defense attorney now, or you can wait.
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