I discovered that my wife has been deleting messages exchanged with a man whose house she cleans. I'm seeking advice or thoughts on how to approach this situation.

Initially, I was worried about my wife spending time alone with a stranger. She assured me that he was hardly ever around, but I later discovered he was present more often than she indicated. Over time, she came home with some cannabis he had given her, which piqued my interest. When I had the opportunity, I checked their messages and noticed they were being deleted. I confronted her about it, and she claimed she preferred to keep her inbox tidy. We had a discussion and agreed that she should stop deleting the messages. A few months later, I found out she was still deleting them. Although she's always home and there's no indication of her being unaccounted for, I'm feeling uncertain about the situation. She does struggle with a painkiller addiction, so I wonder if that might explain some of her behavior.