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Top private investigator shares the four most common signs that suggest your partner could be cheating

Home> Lifestyle

Updated 15:33 4 Jun 2025 GMT+1Published 15:31 4 Jun 2025 GMT+1

Top private investigator shares the four most common signs that suggest your partner could be cheating

Tom Martin says four key signs could spell bad news for your relationship

Lucy Devine

Lucy Devine

A private investigator has shared the four most common signs that your partner could be being unfaithful.

While you might suspect that your significant other is having an affair, it can be difficult to know for sure without any solid proof.

And while of course, nobody wants to find out their partner is cheating, most of us would rather know the truth.

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If anyone knows how to catch a cheater, it's private investigator Tom Martin, who has shared the biggest signs that someone could be up to no good.

A private investigator has shared the four most common signs that your partner is cheating (Getty Stock Image)
A private investigator has shared the four most common signs that your partner is cheating (Getty Stock Image)

The former federal agent told The Independent about the key signs to look out for.

Martin also wrote the book, Seeing Life through Private Eyes, which lists the top 20 'giveaway' signs of a cheating partner.

How have things changed recently?

Martin explained that prior to social media, more people relied on the work of private investigators to help them expose their cheating partners.

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"The game has changed drastically. And technology is 100 percent the reason why," he said.

However, Martin did emphasise that it's important not to jump to conclusions that could 'jeopardise a valuable relationship over what may be unfounded anxieties'.

Martin explained that technology has helped people expose cheaters (Getty Stock Image)
Martin explained that technology has helped people expose cheaters (Getty Stock Image)

What are the four signs?

According to Martin, the most common signs that suggest your partner could be cheating are:

Spending longer at work

Suddenly spending longer in the office could be a red flag when it comes to cheating, with Martin explaining any unexpected change in habit is worth taking note of.

Business trips

According to the private investigator, frequent 'business trips' could also be a cause for concern, especially if they have seemingly come out of nowhere.

Less sex

Fluctuations in how much sex a couple has is completely normal, but Martin claims it could also be a tell-tale sign that your partner is being unfaithful.

Being defensive

The expert also believes that getting defensive could also be a red flag and a potential sign that your partner is hiding something from you.

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Martin revealed four of the most common signs (Getty Stock Image)
Martin revealed four of the most common signs (Getty Stock Image)

Martin's full list is as follows:

  1. Sudden change of habits
  2. Leaving home early and coming back late
  3. Numerous business trips
  4. Questionable holiday or family event absences
  5. A noticeable increase in overtime
  6. Unexplained spending
  7. Secret social media accounts (or emails)
  8. Hidden credit card bills
  9. Excessive grooming or self-care
  10. Smelling like someone else
  11. Buying presents you haven't seen
  12. Items that can't be explained - e.g. condoms in the car
  13. Suddenly joining a gym
  14. Missed calls from an unknown number
  15. Text messages that appear coded or secretive
  16. Less sex
  17. Evasiveness or defensiveness
  18. They tell obvious lies
  19. Having a short temper
  20. Dislike surprise visits (your unexpected arrival may come at an inconvenient time for a cheater)
Featured Image Credit: Getty Images/Peter Cade

Topics: Sex and Relationships, Lifestyle, Technology

Lucy Devine
Lucy Devine

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