What case can any wife file against her husband and his GF ?

A wife can file a case against her husband and his girlfriend for cruelty, or domestic violence, depending on the specific circumstances of the case.

1. Cruelty: If the husband and his girlfriend are treating the wife with cruelty, such as physical or mental abuse, harassment, or emotional distress, the wife can file a case of cruelty against her husband and his girlfriend. Cruelty is also a criminal offence under Section 498A of the IPC.

2. Domestic Violence: The Protection of Women from Domestic Violence Act, 2005 defines domestic violence as any act of commission or omission that harms or injures or endangers the health, safety, life, limb or well-being of a woman or tends to do so, and includes physical, sexual, verbal, emotional, and economic abuse or threats of such abuse. If the husband's extra-marital affair causes mental or emotional harm to the wife, such as through verbal abuse or mental harassment, or if the husband neglects the wife's financial or emotional needs due to the affair, the wife can file a domestic violence case against him.
   If the wife can provide evidence that the husband's girlfriend is involved in any act of domestic violence against her or that the girlfriend is aiding or abetting the husband in committing acts of domestic violence against her, then the wife can implead the girlfriend as a co-accused in the domestic violence case. 

The wife will also need to provide evidence to support her case, such as eyewitness accounts, photographs, recordings, or any other relevant documents.

1. Domestic Violence Act: If the wife faces physical, emotional, or economic abuse by her husband or his girlfriend, she can file a complaint under the Protection of Women from Domestic Violence Act, 2005. This act provides protection and remedies to victims of domestic violence.
2. Maintenance: If the husband neglects his financial responsibilities towards the wife due to his relationship with another woman, the wife can file for maintenance under Section 125 of the Code of Criminal Procedure (CrPC).
3. Dowry Harassment (Section 498A): If dowry harassment is involved in the situation, the wife can file a complaint under Section 498A of the IPC.
4. Divorce: If the wife wants to end the marriage due to her husband's infidelity or cruelty, she can file for divorce under various grounds recognized by the Hindu Marriage Act, Special Marriage Act, or other applicable laws.
5. Other Relevant Laws: Depending on the specific circumstances and state laws, the wife may have additional legal options to pursue her case.