The single time I’ve snooped, it wasn’t over a question of fidelity, but of finances. My ex-wife had (among other things) a spending addiction, and was thoroughly dishonest about the extent of the problem. Whenever I’d question her about it, I’d get gaslighted. It got to the point where there were a dozen or more boxes a day showing up from the shopping channels. When I would ask how she was affording all of that crap despite having virtually no income, she’d shuck, jive, and accuse me of either trying to control her or of not “supporting” her enough as she “tried” to control herself.
For the sake of keeping the peace (like I said, she had other problems), I managed to convince myself that I bore some, if not most, of the responsibility for her problem. Still, carrying the load for all of the household expenses on my meager income began to wear on me, and eventually, the cognitive dissonance was too hard to handle.
So I read her email. I knew her password already - I’d set it up years earlier, but never before felt compelled to use it, despite all of the insanity and bullshit I’d been dealing with from her. And I never used it after. I felt like a bastard for doing it, but I was a righteously angry bastard, because I found incontrovertible proof that she’d lied to me over and over and over and over, all the while accusing me of being the liar, the cheat, and the spendthrift.
So why didn’t I just leave her instead of snooping, like most of the people here are suggesting? Because I was young and dumb, she was crazy, and we were married. It’s one thing to file for divorce over infidelity - nobody’s going to look down on you for it. Leaving somebody over addiction, mental health issues, and unemployment is a little more tricky, especially when your entire upbringing has taught you that what the mentally ill need, more than anything, is empathy and support from their loved ones.
I’m older and wiser now, I don’t think I’d ever do the same thing again - I would just leave. But I can’t say that I regret doing what I did when I did it.