that's probably the reason

From the officer's point of view, it's true marriage why you are so nervous. Since you two have known each other for 6 years, you two should know each other pretty well. What questions they asked? Were you not able to answer some questions? Did officer tell you that she/he is not convinced? Maybe just need check more evidence you submitted. Don't need to be so nervous.Were your hu*****and worried? If your hu*****and appears calm and doesn't matter, and you appeared so nervou, that would have looked suspicious.