How to safeguard husband

Pls advice. The wife is mentally harassing the husband upon his pre marital affairs. He had told her about the same before marriage. Later she got in touch with his ex girlfriends to know about him and that's when they started calling him again. Husband even moved out of the city with her to pacify her. One night upon heated argument she even called for police and threatened to file case of domestic violence and infidelity. Can the husband send a divorce notice based on mental harassment case. Will this be able to help in future if she even falsely accused him of voilance?