He cannot revoke your GC, neither USCIS. Only immigration judge can do it.
I hope you filed AR-11 as required within 10 days of moving.
Keep evidence safe and make offline and digital copies. Make sure your passwords are strong and not known to your ex.
I wouldn't interact directly with the spouse. If I was you I'd hire a divorce attorney and only communicate with soon to be ex through written communication ran by lawyer. Unless splitting millions of dollars, I'd simply try to divorce ASAP by giving him all or most what he wants, so he doesn't have any point to contest.
Your ex put a lot off effort proving your marriage was bonafide. So unless they have anything compelling, your divorce waiver would be faster and easier to approve.