Citizenship

I am still in shock after the interview this morning. The officer was nice and I passed the test with flying colors. My citizenship application was granted and I was told to wait in the lobby for the oath ceremony notice. When the officer came out again, she told me that my application had been "continued" based on the suspicion that my marriage was illegitimate. Their decision defies logic. I already got a green card one year before my marriage. Why would I want to marry someone for citizenship when I can get it on my own? I feel that I was treated unfairly like a second class citizen in spite of the fact that I am not a citizen yet.