Thank you for the opportunity to assist you. I answered the other question you posed for a higher value but it was locked. Below is my answer which covers that question and this one.
Q) Do I have a case?
If your ex never divorced his former wife, he was never legally married to you. That means he couldn't have been divorced from you since you two were never legally married. Unless people are married or are registered domestic partners, the attributes of divorce
(an equitable division of marital assets) doesn't apply.
His actions may be criminal in nature as well. If he used your marriage
to effectively defraud you out of money, that's potentially a crime.
Contact your local law enforcement. They may refer you to the FBI, I'm not sure.
You should also seek help from a top-notch divorce attorney who can file a motion to set aside your divorce judgment. That would "un-do" the judgment where you lost so much money. You and he would only be entitled to what you owned in name title, not anything of what the other "spouse" owned or acquired during the marriage.
I hope my response has been helpful. If you have follow-up questions or concerns on this topic, please ask. I'll get back to you as quickly as I can, although I may not be online at the moment you respond.
Otherwise, I hope you will rate my answer positively as that is the ONLY way I receive credit for my work, and doing so will NOT cost you an additional fee.
Best wishes to you,