All praise is due to Allah, and may peace and blessings be upon the Messenger of Allah.
Divorce is not a legislated Islamic remedy for the evil eye and envy. There is no established evidence in Islamic law that divorcing one's wife nullifies the effects of the evil eye or removes envy.
Islam has prescribed Islamic ruqyah, remembrance of Allah, and authentic supplications as remedies for the evil eye and envy. Among these is the supplication of the Prophet ﷺ:
"In the name of Allah, I perform ruqyah for you against everything that harms you, against the evil of every soul or envious eye. May Allah heal you. In the name of Allah, I perform ruqyah for you." Narrated by Muslim.
If the person who afflicted someone with the evil eye is known, it is prescribed to ask that person to perform ghusl using the water remaining from their ablution, as established in the Prophetic Sunnah.
As for pretending that marital disagreements exist or spreading news of separation when no actual divorce has taken place, some scholars have stated that there is no harm in doing so if it is reasonably expected to ward off the harm of an envious person, provided that no harm or corruption results from it.
However, one should not resort to an actual divorce or use it as a means of treating the evil eye and envy, because of the serious religious and social consequences that may follow.
One must maintain regular remembrance of Allah, perform Islamic ruqyah, place one's trust in Allah, and firmly believe that healing is in His hands alone.
We ask Allah to protect married couples from the evil eye and envy and to unite their hearts.
And Allah knows best.