Mahesh,
If you are so sure that nothing will work out with mere conversations and mediation by other family members, then simply file in a case for RESTITUTION OF CONJUGAL RIGHTS - U/S 9 of Hindu Marriages Act., and please dont act advance and get confused by misleads of getting anticipatory bails etc. but remember one thing the moment you file a case against her she will surely go for 498 A, or DV Act. so beware of consequences.