You can file a petition for annulling your marriage by a decree of nullity on the grounds of her adulterous life which existed in the pre-marital life and continuing till this date even after marrying you. You may have to produce clinching evidence for this to prove your case.
An annulment is a legal procedure which cancels a marriage between a man and a woman.
The ground is that the petitioner has, with his or her full consent, lived with the other party to the marriage as husband or wife after the force had ceased to operate or, as the case may be, the fraud had been discovered;
that the petitioner was at the time of the marriage ignorant of the facts alleged;
that proceedings have been instituted in the case of a marriage solemnized before the commencement of this Act within one year of such commencement and in the case of marriages solemnized after such commencement within one year from the date of the marriage; and
that marital intercourse with the consent of the petitioner has not taken place since the discovery by the petitioner of the existence of the said ground.
You may have to prove that they were living as husband and wife prior to this marriage unless the annulment petition cannot be maintainable;
In that case you may have to wait for completion of one year to file a contested divorce case on the grounds of adultery.