Please see the answer to your other question.
You need to move on with your life and stop obsessing about him.
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The USCIS will consider your affidavit(s) as red flags to possible immigration fraud. However, it is up to the USCIS and ICE to take any action regarding the granting or denial of his I-751. Without knowing more about the situation it is not possible to provide further advice.
Unfortunately, he probably has a good chance of success.
Consider hiring a lawyer ... to do a 'better' job of providing evidence to immigration.
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Hard to say for sure ( I don't know who you reported this information to, and if it will get back to the file at Boston USCIS); but I doubt he will have an easy time of it.
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