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In order for you, as the Plaintiff to recover damages in a lawsuit against the defendant for defamation of character, you would have to plead and prove the following -
1. The defendant has made (or is making) false and derogatory statements about you; 2. The defendant is making these statements, despite knowing they were false;
3. The defendant made these false and derogatory statements to a third party (If they were made in the form of a letter to a third party, it is called "libel", if these statements were made verbally, then it is called "Slander");
4. You (the Plaintiff) suffered damages as a result of these defamatory statements. But, if your ex's statements accuse you of committing the crime of fraud against the credit card company, then the law does not require you to prove that you sustained damages, because the general legal principle that applies to these situations, states that where a defendant's false and derogatory statements accuse a Plaintiff of the commission of a crime, the Plaintiff is not required to prove damages or the extent of his damages because the law presumes that a Plaintiff has sustained damages if the defendant makes false statements to third parties that the Plaintiff has committed a crime.
In order to protect your name and reputation, you would file your lawsuit against the defendant and you would ask the Court not only to award you damages, but you would also ask the Court to issue an Injunction (which is a Court Order) against the defendant, Ordering the defendant to immediately cease and desist making any further statements to third parties that you had committed the crime of fraud. If the defendant disobeys the Court's Order, then the defendant would be subject to Contempt of Court which carries a jail sentence of up to six (6) months,
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