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Private investigator reveals the one sentence that means 'your partner is cheating'

Home> News> Sex & Relationships

Published 19:18 15 Aug 2025 GMT+1

Private investigator reveals the one sentence that means 'your partner is cheating'

Ali Marsh has been a private investigator for ten years and knows more about cheaters than most

Britt Jones

Britt Jones

A private investigator has revealed the one sentence your partner says that indicates they’ve been unfaithful, and you’re going to want to know what it is.

When people get an inkling that their beloved is cheating on them, it’s astounding the lengths they’ll go to in order to prove it.

I once knew someone who bought a GPS tracker and slipped it into her husband’s shoe. She then found out that his ‘fishing trips’ were just him baiting women with his own worm, and not sea creatures.

Another person used Snapchat’s map to discover her bestie of eight years and her boyfriend had been meeting up in the dead of night back in high school.

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Oh, the tales I could tell…

It’s a lot of effort to go through, when there’s a much simpler solution.

People will read messages, follow cars, check bank accounts and more, but it’s actually all in what they say to you, according to a private investigator.

Ali Marsh said that there’s one thing they will say that indicates they’re seeing someone else.

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The expert shared how you can tell someone is a cheater (Getty stock images)
The expert shared how you can tell someone is a cheater (Getty stock images)

With over 10 years in the business, she knows the common occurrences when it comes to cheaters.

Explaining to the Daily Telegraph, she said there’s going to be an emotional and social shift in someone who is possibly cheating on you.

She shared how if a partner has caught feelings for a work colleague, they’ll start to talk about them.

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Let's be honest, this probably applies to people that are cheating with others that aren't even in the same workforce.

She said: "If they have fallen for someone at work, they may mention them often."

She added that they’ll come up with ways to talk about them, even when they know they can’t, telling the outlet: "They want to talk about them but they can't, so they say, 'So and so did this today'."

If that doesn’t seem to be a topic they’re discussing, then a therapist also has a few tips on what cheaters tend to do.

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Elena Touroni, a consultant psychologist working for a clinic in London, England, wrote for the Telegraph some ways you can spot a cheater.

She said: "Generally, if a person has cheated once, there’s a psychological reason behind it, meaning they will tend to do it again.”

They might also freak out at the thought of being committed to someone.

The private investigator said your partner will find a reason to bring the person they are cheating with up in conversation (Getty stock images)
The private investigator said your partner will find a reason to bring the person they are cheating with up in conversation (Getty stock images)

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There’s even clues they let out when they’ve not yet been caught out.

"When one person in a couple I am seeing is cheating, but hasn’t admitted to it, I can often tell. Usually there’s something about their stories that doesn’t add up," the expert shared.

"If one party in the relationship is still very invested and committed to it continuing, but you see the other party acting in a way that doesn’t reflect that commitment, or their behaviour doesn’t really make sense, then there is something missing.

"As the relationship therapist, you feel that something isn’t resonating about why these two people are really struggling. Usually you find the answers in the person’s background – you begin to dig into their history and discover clues."

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She said: "Perhaps they are more likely to be unfaithful because they have low self esteem? Or because their partner is very dynamic and they’re feeling somewhat neglected?"

Featured Image Credit: Getty Stock Images

Topics: Sex and Relationships

Britt Jones
Britt Jones

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