You have to engage with him in a positive manner first, ask him politely to correct the accuracy of the statements. If he doesn't within a few days then pressure him again, perhaps mentioning your desire to 'not' involve a legal team. That should do it. Of course if he reacts badly it make swiftly become a good idea to involve lawyers as he's really stepping over the mark.
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Yes this is the case. He's now claiming that he was the originator for the idea which is far from the truth.
You have to engage with him in a positive manner first, ask him politely to correct the accuracy of the statements. If he doesn't within a few days then pressure him again, perhaps mentioning your desire to 'not' involve a legal team. That should do it. Of course if he reacts badly it make swiftly become a good idea to involve lawyers as he's really stepping over the mark.