So under Colorado law you can obtain an annulment of a marriage based upon fraud but it must go to what is called the "essence" of the marriage.  What is considered the "essence" is different in every matter and turns on the specific facts of each case.  You should call and consult a reputable divorce lawyer to see if your facts are supported by case law.  If they are, you would file a Petiton for Annulment. There is always the option of a civil divorce and Religious annulment as well.  Good luck.