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If this person is making known false statements about you to third parties, you would have a right to sue him for the damage he is causing to your character in the community and seek money damages. Accusing you of stealing or using drugs is considered defamation per se and you can sue without proving monetary damages for those types of severely damaging statemtns about your reputation.
At this point you need to sue him and get an injunction to stop him from making further false allegations and also seek damages from him for the comments.
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