Final answer:
Villefort discovered that his wife had betrayed him.
Step-by-step explanation:
When Villefort arrived home, he discovered that his wife had betrayed him. In the book (source), Villefort describes how he sees his wife looking fresh and beautiful, but as he goes to embrace her, he is struck with a stunning blow on the neck, followed by darkness and silence.
When Villefort arrived home, he discovered a scene that at first seemed idyllic, with his wife appearing fresh and joyful, preparing to greet him. However, this vision quickly turned ominous as he felt a stunning blow upon his neck, followed by darkness and silence, suggesting a twist of fate or perhaps the harsh return to a grim reality.
The passages provided do not explicitly detail the actions of Villefort's wife in his absence, instead offering different narratives that explore themes of betrayal, work, and the complexities of relationships, none of which give a definitive account of what Villefort's wife did.