File an application in the maintenance petition. You should file an application in the maintenance petition filed under Section 125 crpc. According to Section 125(4) crpc, the wife cannot get maintenance if she has been living in adultery. You have evidence to prove her extramarital relations.
File a divorce case. You have evidence to prove her extramarital affairs. Your wife has been living in adultery. Section 13 of the Hindu Marriage Act envisages adultery as a ground of divorce. Hence, file a divorce case in the Family Court.
Adultery disentitles the wife to get maintenance. Her petition of maintenance under Section 125 crpc will fail, and the court will dismiss her petition if you file an application immediately and protest her claim of maintenance.
No wife is entitled to receive an allowance from her husband under this section if she is living in adultery or if, without any sufficient reason, she refuses to live with her husband, or if they are living separately by mutual consent.
File a petition for quashing of the 498-A case. You should file a petition before the High Court under Section 482 crpc for quashing the 498-A case. Your wife has no evidence of cruelty, and you can prove that after revelation of her extramarital relations, she has filed this complaint. The High Court will quash this criminal proceeding.