1. The wife can file case under PWDV Act or u/s 298A IPC irrespective of the fact whether the husband files files suit for divorce or not.
2. So you have to decide whether you want divorce or not. Thinking future uncertainties will not help you.
3. There is no preventive action but if such cases are filed there are many things to be done to thwart the damage.
4. You can obtain anticipatory bail and once you get the same you win half the battle.
5. Then nothing remains in the 498A case though if your wife is unemployed you have give her maintenance.
6. If you are innocent you would not face difficulty to prove your innocence.