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If you have any feeling at all that he might be serious, or if you feel threatened/harassed in any way, you must contact the police. If he is serious, at least the police are now aware of it and they can assist with you getting a restraining order against him. If he is not serious, at least you have created a record of the situation in case this continues to escalate. There really is not much else I can tell you other than contact the police.
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