If there is trust...there should be no need to open each other's mail, unless asked to do so...
Without trust, there just isn't much of a relationship.
Of course, with her having an affair there wasn't much of a relationship anyhow.
You'd have to post a lot more details than that to expect any sort of coherent answer.
But let me ask you this: if you and your wife have separate bank accounts, is it fair to take her debit card and withdraw money, if you find the PIN number somewhere?
Here is an article about the case in question. It is from canoe.ca.
A man from Rochester Hills, Mich., could face up to five years behind bars for reading his wife's e-mails.
Oakland County prosecutors have charged Leon Walker, 33, with an anti-hacking felony normally reserved for identity theft or stealing trade secrets, reports the Detroit Free Press.
Leon Walker, Clara Walker's third husband, broke into his wife's Gmail account on her laptop and discovered she was having an affair with her second husband, the newspaper reports.
He then forwarded the damning e-mails to Clara Walker's first husband, who is the father of her young boy. Leon Walker told the Free Press that he had to do it for the sake of the child because the second husband was once arrested for beating Clara in front of the boy.
"I was doing what I had to do," he said. "We're talking about putting a child in danger."
Clara Walker's lawyers said Leon Walker, a computer technician, used his skills to violate his wife's privacy and took it one step further by using what he found against her.
After learning of her husband's digital spying, Clara Walker filed for divorce, which was finalized last month. Her ex-husband is due in court Feb. 7.
"It's going to be interesting because there are no clear legal answers here," Frederick Lane, a Vermont attorney who has published five books on electronic privacy, told the Free Press.
He noted the fact that Walker regularly had access to the computer in the home they shared could work in his favour.