Failure to respond to that RFE is a guaranteed denial. Failure to answer the RFE sufficiently is a guaranteed denial. Now is the time to throw everything you have at them.....especially evidence showing you live at the same address, evidence of shared expenses, and evidence you are actually sharing your lives together. Normally, such evidence should be plentiful. Concentrate on what you have.
Good luck. Now is the time to think about what evidence you can muster.