Call her Tessa. Her husband Mark had started taking his phone to the shower. Not once; every time. He had changed the code in March. When she asked, lightly, he said work had made everyone update their security, which was plausible and which she didn’t believe. Now it’s late and the phone is on the nightstand and she saw him type the new code on Tuesday. She has been lying awake for twenty minutes deciding whether she is the kind of person who looks.
The honest answer
Probably not, and not for the reason you think. Not because it’s a violation, though it’s one, and not because you’ll never forgive yourself, though some people don't. The practical reason is that looking doesn’t answer the question you’re actually asking. If you find nothing, you won’t feel reassured; you’ll assume it was deleted. If you find something, you’ll now have to decide whether to confess how you know, and the conversation will start with your transgression instead of his. Either way you wake up tomorrow with less trust than you went to bed with, and trust was the thing you were trying to check on.
The urge is the information
Tessa doesn’t have a phone problem. She has a marriage in which her husband changed his behavior and her question about it got a smooth answer she didn’t believe. That’s the whole situation, and it’s already enough to act on. The impulse to look is your nervous system telling you that something has changed and you aren’t being told what. You don’t need the evidence. You need the conversation.
The conversation instead of the phone
Not the interrogation. Not “why did you change your code.” The report: “Since March you've been taking your phone everywhere and I've been lying awake about it. I'm asking you straight: is there something I should know?” Say it in daylight, sitting down, with time after it. Then listen to the whole answer, including the pauses. Most people can’t lie well to a direct, calm question from someone they live with. The answer is often in what they do with their hands.
If you already looked
And found nothing: you’ve learned that the problem is the distance, not the phone, and you now owe a confession of your own. Make it. “I looked at your phone last night and I hate that I did, and I need us to talk about why I got there.” That sentence has started a lot of honest marriages.
And found something: don’t argue it at midnight. Do not screenshot and confront. Get through the night, and in the morning say what you found and how you found it, in that order. The road from there’s a real one and it’s walkable; it’s in Rebuilding trust after an affair, and it goes better with a therapist than without one.
When checking is a pattern
If you check regularly, or your partner checks yours, or one of you demands the codes as a condition of peace, that’s monitoring, and monitoring is a control pattern rather than a trust one. It isn’t solved in couples therapy; it’s a reason to talk to a therapist on your own first. And if you’re the one being monitored and it frightens you, that’s what 988 is for.