You may get issue a legal notice and then proceed to get divorce by filing a divorce petition as per following procedure:
23. Judicial separation.-(1) A Petition for judicial separation may be presented to the District Court either by the husband or the wife.-
(a) on any of the grounds specified in sub-section (1) and sub-section (1-A) of Sec. 27 on which a petition for divorce might have been presented;or
(b) on the grounds of failure to comply with a decree for restitution of conjugal rights and the Court, on being satisfied of the truth of the statements made in such petition, and that there is no legal ground why the application should not be granted, may decree judicial separation accordingly.
(2) Where the Court grants a decree for judicial separation, it shall be no longer obligatory for the petitioner to cohabit with the respondent, but the Court may, on the application by petition of either party and on being satisfied of the truth of the statements made in such petition rescind the decree if it considers it just and reasonable to do so.
Nullity of Marriage and Divorce
Section 24. Void marriages
(1) Any marriage solemnized under this Act shall be null and void (and may, on a petition presented by either party thereto against the other party, be so declared) by a decree of nullity if-
(i) any of the conditions specified in Cls.(a),(b), (c) and (d) of Sec. 4 has not been fulfilled : or
(ii) the respondent was impotent at the time of the marriage and at the time of the institution of the suit.
(2) Nothing contained in this section shall apply to any marriage deemed to be solemnized under the Act within the meaning of Sec. 18, but the registration of any such marriage under Chapter III may be declared to be of no effect if the registration was in contravention of any of the conditions specified in Cls.(a) to (e) of Sec. 15:
Provided that no such declaration shall be made in any case where an appeal has been preferred under Sec.17 and the decision of the District Court has become final.
Section 25. Voidable marriages
Any marriage solemnized under this Act shall be voidable and may be annulled by a decree of nullity, if-
(i) the marriage has not been consummated owing to the wilful refusal of the respondent to consummate the marriage ;or
(ii) the respondent was at the time of the marriage pregnant by some person other than the petitioner; or
(iii) the consent of either party to the marriage was obtained by coercion or fraud, as defined in the Indian Contract Act, 1872 (9 of 1872):
Provided that in the case specified in Cl.(ii) the Court shall not grant a decree unless it is satisfied-
(a) that the petitioner was at the time of the marriage ignorant of the facts alleged;
(b) that proceedings were instituted within a year from the date of the marriage; and
(c) the marital intercourse with the consent of the petitioner has not taken place since the discovery by the petitioner of existence of the grounds a decree :
Provided further that in the case specified in Cl.(iii), the Court shall not grant a decree if,-
(a) proceedings have not been instituted within one year after the coercion had ceased or, as the case may be, the fraud had been discovered; or
(b) the petitioner has with his or her free consent lived with the other party to the marriage as husband and wife after the coercion had ceased or as the case may be, the fraud had been discovered.