Divorce on conjugal rights ?

can any one answer if the wife goes away by her wish with children n start living in other flat in same city,what are the ways to to move to court for husband to take contested divorce, n what grounds she will contest apart from mental cruelty on the basis of whatsapp message and any fight episode of husband slapping her once in front of children ? what are the ways husband can take divorce as he does not want her back but above all she does not want divorce as she needs pension from her husband govt job in future and she is working as teacher in Pvt schools for 14 yrs n now hold principal post of private school with salery of 70 k plus n her husband salery is 1.70 lakh in govt job and accommodation free. ? can any one guide or give me person name number so I can contact him ?