There’s a specific kind of exhaustion that comes from not knowing.
Not the tiredness of a long day. The bone-deep, can’t-switch-off, middle-of-the-night exhaustion of living with suspicion that never gets confirmed or denied. Of watching someone’s face when they check their phone. Of talking yourself out of your own instincts over and over because every time you raise it, somehow it becomes your fault.
If you’re at the point where you need to know — really know — this is the practical guide for that.
But before you go any further, read this first: Narcissistic Cheating: Why Catching Them Isn’t What You Think It Will Be
That post covers the single most important truth about this whole process — that showing a narcissist your evidence doesn’t expose them, it teaches them what to hide better next time. Read it first. Then come back here for the practical steps.
Before You Start: The Most Important Question
Ask yourself honestly: am I prepared to receive whatever answer comes?
Not the answer you’re hoping for. The actual answer — which may be worse than you’ve imagined.
I say this from experience. What I discovered wasn’t just an affair. It was a pattern of random hookups with strangers, on a regular basis, that had been hidden, explained away and gaslit for a long time. That is a different category of information to sit with. It has implications for your health, your safety and your entire understanding of the relationship you thought you were in.
If you are not in a stable enough place to receive that right now, please wait. Get support in place first — a therapist who understands narcissistic abuse, someone who can be with you when things land.
If you’re ready — here’s what actually works.
What to Check Yourself (With Caution)
I want to be clear upfront: DIY investigation has serious limitations and real risks, which I’ll cover below. But there are some things that are accessible, legal, and can surface genuine patterns — if you approach them carefully and from a stable emotional state.
Not at midnight. Not after a drink. Not alone in a spiral.
1. Google Maps Location History
If you have access to a shared device, or their Google account is signed in somewhere you can see, Google Maps keeps a detailed Timeline — a log of everywhere that device has been, with dates, times and how long it stayed there.
This was one of the first things that made it impossible for me to keep doubting myself. The map showed regular visits to addresses I didn’t recognise. Not once. Not twice. Consistently, on specific days, at specific times that always had an explanation attached — an explanation that suddenly made no sense at all.
It’s not proof in a legal sense. But it is a pattern. And patterns, when you’ve been gaslit into doubting your own perception, are profoundly grounding.
2. Rideshare Trip History
If your partner uses Uber, DiDi or a similar rideshare service — and if you have access to the account or a shared payment method that shows trip charges — the trip history records every pickup and dropoff location, with the date and time.
For me, this told a very clear story. Trips to unfamiliar suburbs, on the evenings I’d been given very different explanations for. Not once or twice — regularly, in a pattern that was impossible to explain away.
3. Phone Number Searches
If you’ve noticed a number appearing repeatedly — in call logs, in screenshots, in notifications you’ve glimpsed — a basic name search of that number online can sometimes surface profiles or accounts you didn’t know existed.
Narcissists who are highly deceptive often operate multiple phone numbers from a single device. eSIMs, VoIP apps and second number services make this easy and essentially invisible unless you know to look.
One important warning: a username or profile name on its own is not definitive evidence. The same username can be used by completely different people across different platforms. I made the mistake of getting deeply upset over something that wasn’t what I thought it was. Don’t act on a single piece of evidence in isolation, especially when you’re already emotionally activated.
Why DIY Investigation Usually Backfires
Even when the evidence you find is real and accurate, gathering it yourself — while in emotional freefall — creates serious problems.
You cannot be objective. When you have been deliberately gaslit, your ability to evaluate evidence neutrally is severely compromised.
It escalates your distress. Every hour you spend digging is an hour inside a trauma response. It does not bring clarity. It brings more anxiety, more rumination, more sleepless nights.
It gives the narcissist ammunition. If they discover you’ve been investigating, they will use it against you. Suddenly you’re the unstable one. The obsessive one. The controlling one.
DIY evidence may not hold up legally. If you need evidence for separation, custody or property settlement, informally gathered information may not be usable in the way you need.
Why a PI Is the Better Option
A licensed private investigator who specialises in infidelity — and ideally one with experience in narcissistic relationship dynamics — does something you genuinely cannot do for yourself right now.
They look at it without emotion.
They gather clean, documented, legally obtained evidence. They produce reports with timestamps, locations and documented observations that can be used in legal settings. And they present the findings to you in a controlled, professional context — not in a 3am spiral.
What to bring to a PI consultation:
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Full name, DOB, address and work address
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Vehicle details — make, model, colour, plates
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Usual daily routine and suspicious regular time slots
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A brief relationship summary
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Patterns you’ve already noticed — times, locations, behaviours
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Your goal — legal evidence, personal clarity, or both
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Your budget and any hard boundaries
Ask the PI upfront:
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What methods do you use and are they legal in my state?
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Do you have experience with narcissistic relationship dynamics?
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What is your confidentiality policy?
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How will you present the findings to me?
Being Prepared for the Answer
The constant gnawing of not knowing is genuinely damaging. It affects your mental health, your emotional stability, your physical health, your sleep, your relationships and your ability to function. Living in that state long-term is not sustainable.
But you need to have decided in advance what you’re going to do with the information. Will you speak to a lawyer? Call a trusted friend? Book a therapist appointment?
Because the moment you have confirmation, you need to move — not react. Moving is intentional. Reacting hands control back to them.
After You Have the Answer
Do not confront the narcissist with what you’ve found.
The evidence is for you. It is for your lawyer if needed. It is for your own decision-making. It is not a confrontation tool — and it will not make them confess, apologise or change.
Use it to take your next step. Quietly. Deliberately. On your terms.
If you’re still processing whether what you’re experiencing is narcissistic abuse at all: Understanding Narcissistic Abuse
If you know it’s abuse but can’t seem to leave: Trauma Bond Recovery
If you’re being told you’re imagining things: Gaslighting Signs
You deserve to know the truth. But more than that — you deserve to use that truth to build a life that is yours.