Whether to report the person is a personal choice that you have to make, it is not a legal question. It is hard to give a simple "yes" or "no" answer to whether you'll be accused of anything. You should sit down with an experienced Immigration Attorney and tell him/her all the facts. If you do end up reporting him to the USCIS, give all the facts to the USCIS, truthfully.
All comments and/or opinions are for general information, and should not be used as legal advice. In addition any comments and/or opinions do not create an attorney-client relationship. In order to obtain a comprehensive and accurate legal opinion you should consult an attorney with the specific and detailed facts or your case/question.
You can only be held liable if you knowingly participated in the marriage fraud, and if a finding of marriage fraud is actually entered. Contact an immigration attorney directly for more information.
Gunda J. Brost Brost Law Office This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.
As an attorney with considerable experience with criminal law and immigration law, I suggest that you consult with an immigration attorney and a criminal defense attorney BEFORE discussing this matter with the government. It is important for you to know your rights and liabilities when make a decision of this nature.