Clumsyheir1

Do understand it is a category ... a visa category (and this person is IN the Philippines, not USA, IF already in the USA it would then be a green card).     

Hhmm i was on eb2 category few years ago but never heard that you can do that being outside of US. Good to know. Thanks.

Have you talked to your Employer and their Lawyer.

If the employers lawyers are good then they should have a chance to get it affirmed.   Unfortunately nothing is fast with the uscis

From what I have read the most common reason is that the consular found something in the underlying petition that caused them to believe the petition should not have been approved.   They are sending back for reaffirmation or denial.   Once the uscis receives the petition they are required to provide the reason to the petitionner as well as allow the petitionner to respond 

The refusal must be based on other factors as the marriage is not it.

To clarify:  The OP is not in the US.  The OP has interviewed for a EB visa in order to enter the US as a worker.........when and if the OP enters the US via the EB visa, it can lead to a Green Card.....
 
All US entry visas are obtained outside the US.......

They are applying for an EB-3 visa. That will result in permanent residency upon entry into the US.
Why not? There is no requisite to have any other visa or work in the US first. Many people get an EB-3 visa abroad.

I don't think so. EB3 is employment so it doesn't matter if you're married, not married, have 5 kids or no kid. How did your interview go? What did they ask? Did they seem to focus on your employer or on you? Most of the time, it is because they don't believe there is a valid employer-employee relationship or they don't believe the employer intend to or be able to continue the employer-employee relationship after you arrive in the US. Without more details, it is hard to say. I believe the procedure to return to USCIS is similar to FB petitions, that is once USCIS receives the returned petition from State, they will issue a NOID to the petitioner, the petitioner has a certain amount of time to respond and rebut. Then USCIS can either reaffirm the case and send back to the Consulate for another interview, or the will revoke the petition. 
 
 

EB3 is an employed base visa, not sure that marriage matters, for sure would not change the visa type.

The OP is not a US citizen......it was an EB3 visa.