He used to leave his phone face-up on the kitchen counter, buzzing away, and you never gave it a thought. Now it goes everywhere with him, even the bathroom, and when it lights up he flips it over like a card he doesn’t want you to see.

Maybe the phone isn’t even your thing. Maybe it’s the Thursday “meetings” that run until ten, or the way he says “nothing” half a second too fast. So you end up typing I suspect my husband is cheating but I have no proof into Google at midnight, screen brightness turned down so he won’t see the glow. If that’s you right now, I’m sorry. It’s a lousy place to be. You can’t ask him yet, you’re too embarrassed to tell anyone, and your mind keeps replaying the same three moments.

This isn’t a “catch him in the act” guide. It’s about finding out what’s true without wrecking your life over a feeling.

Get it out of your head and onto paper

Find a notebook. A real one, not your phone, because your phone is where the spiraling happens.

Draw a line down the middle of the page. On the left, write only what you’ve actually seen: “Started locking his phone in March.” “Home after ten, three Thursdays in a row.” On the right, write what you’re guessing: “He’s distant.” “There’s someone else.”

Sometimes the left side is embarrassingly short and the right side runs off the page. That tells you worry is doing most of the talking. Other times the left side fills up faster than you’d like. That’s useful too, even if it stings.

A locked phone proves very little

Every article gives you the same list: secretive phone, less sex, sudden gym obsession, money that doesn’t add up. All of that does show up in affairs. It also shows up in men who are depressed, in debt, hiding a gambling habit, or quietly terrified because they got passed over for a promotion and can’t say it out loud.

So one sign is a question. Two or three starting around the same time begin to look like something. But what really matters is the lie you can catch. A story that changes between Tuesday and Friday. A receipt from a place he swore he never went. I’d weigh that far more than any password.

Be a bit honest about your own wiring, too. Barely sleeping? Rough year? Been cheated on before? Then your alarm is going to be set to hair-trigger. Your feelings are still real, but you’ll want to read them slowly.

Resist the 2 a.m. phone search

I know. You’re alone, he’s asleep, it’s right there.

But picture how it ends. You find nothing, and you don’t believe it, so you check again next week. Or you find something, and you’ve learned it exhausted and shaking with zero plan, and the fight that follows becomes about you going through his things.

And please don’t text your sister, two cousins and your old roommate. Once five people know, you can’t take it back if you’re wrong. Pick one person. Someone steady, someone who doesn’t gossip, someone who’ll ask “what do you need?” instead of “do you want me to key his car?”

A woman I’ll call Dana waited four months before saying anything. By the time she did, she’d rehearsed the confrontation so many times that she wasn’t listening to his answers, only waiting for her next line. It turned into a shouting match about her tone. She walked away knowing exactly what she knew before. That’s the risk of sitting on it too long. The conversation you most need gets spent before it starts.

Starting the conversation

Choose a dull moment. Not in the middle of an argument, and not twenty minutes before his mother arrives.

Start with you. Something like: “I’ve felt far away from you lately, and a few things have been on my mind. I’d rather talk about it than keep guessing.”

No accusation, no name, no evidence thrown on the table. Just an open door. Then stop talking, which is the hardest part.

Watch what he does. A man who cares usually stays in the room, even if he’s hurt or irritated. A man with something to hide tends to flip it, and suddenly you’re discussing your insecurity, your nagging, your “crazy.” Worth noticing. Still, one tense conversation isn’t a verdict. People get defensive when they’re accused, guilty or not. Give it a couple of weeks and see whether he gets more open or his explanations keep shifting.

If he says no and your gut says otherwise

This happens a lot. He denies it, maybe even sincerely, and you still can’t relax.

That’s the time for a therapist. A couples counselor can get things said that never come out at the kitchen table. A therapist just for you can help you tell real signals from old scars, and gives the fear somewhere to go besides every dinner conversation.

And whether there’s an affair or not, a marriage where you feel you have to monitor him is already a problem. You’re allowed to want better than that.

You don’t need proof to take your own unease seriously. Just be careful what you do with it. Start with the notebook tonight.