IF conditions on your temporary (conditional) green card were not removed before it expired in 2016, and you never got a permanent GC, then you have been out of status for 3 years already. You are NOT qualified for naturalization. So you are an illegal alien & have to return home. Did you & your spouse apply for removal of conditions, get approved, & get a permanent GC before your conditional GC expired or not? Your GC must have had a minimum of 6 months remaining validity at the time you applied for naturalization. No valid permanent GC = no naturalization.
That's a bigger problem than the state of your marriage.
Any fraud, deceit, misrepresentation, misstatement or omission of facts in any visa/immigration-related application, interview, etc, is grounds for denial or revocation of any visa/immigration benefit. Fraud regarding the marriage is also grounds for annulment or divorce.
Divorce & return to your country of citizenship. If your info here is accurate, you had to return home back in 2016. You will be barred from reentry to US for a minimum of 10 years.