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The Top Signs of Infidelity an Australian Detective Sees in Almost Every Case

May 26, 2026 7:21 am in by
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According to a prominent Australian private investigator, the most telling signs of infidelity are not hidden in complex digital code. Instead, they are found in everyday habits that are surprisingly old-school.

Cassie Crofts, the founder of Venus Investigations, an all-female agency based in Queensland specializing in dating safety and surveillance, has spent years tracking unfaithful partners. While technology has changed how people behave, Crofts reveals that human psychology remains remarkably predictable. In fact, one of her most reliable indicators of a looming rendezvous is an ordinary trip to the car wash.

@venusinvestigations When people cheat, it’s not always just their own appearance that starts improving 🤔 #privateinvestigator #cheating #dating ♬ original sound – Venus Investigations
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Why the Car Wash is a Major Red Flag

It sounds simple, but Crofts notes a distinct pattern among individuals about to meet an affair partner: they suddenly become obsessed with the cleanliness of their vehicle. This habit is not about removing physical evidence of a crime; rather, it is about making a positive impression.

When someone is in a long-term relationship, the domestic routine often means letting standard upkeep slide. The car fills with old coffee cups and receipts. However, when a partner prepares to see someone new, the desire to impress resurfaces. A sudden, uncharacteristic drive to the local car wash to vacuum the interior and polish the dashboard often indicates that a guest is expected in the passenger seat.

The Shift From Apple Pay to Cash

In a world where almost every transaction leaves a digital footprint, modern unfaithfulness requires a return to traditional currency. Crofts explains that financial transparency is usually the first thing to change when someone is straying.

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If a partner who previously relied exclusively on Apple Pay or credit cards for every minor purchase suddenly starts carrying bundles of cash, it warrants attention. Digital bank statements are easily scrutinised by a suspicious spouse. Cash, conversely, allows for anonymous dinners, drinks, and fuel stops. This deliberate move away from digital convenience is a practical method to ensure that a paper trail does not reveal an afternoon rendezvous.

@venusinvestigations Some cheating signs, like lipstick on a collar, are obvious. Others are much more subtle 👀 #privateinvestigator #cheating ♬ original sound – Venus Investigations

Hidden Tech and Hidden Habits

While the physical clues are traditional, some digital habits have also evolved into subtle forms of concealment. Crofts points out that suspicious partners are increasingly using the standard iPhone Notes app to communicate. By creating a shared note, securing it with a distinct password, and typing messages back and forth inside the document, individuals can hold entire conversations without a single text notification appearing on the lock screen.

@venusinvestigations Technology is catching out more and more cheaters these days… #privateinvestigator #dating #cheating ♬ original sound – Venus Investigations
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Furthermore, tech devices in the home, such as Amazon Alexa, store a thorough voice history that often catches people recording private conversations or making unmonitored calls when they believe they are alone.

@venusinvestigations sneaky sneaky! #privateinvestigator #dating #datingadvice ♬ original sound – Venus Investigations

Behavioral changes also extend to personal tastes. A partner who suddenly develops a passionate interest in an entirely new genre of music, starts using unfamiliar slang, or adopts a random hobby out of nowhere is often being influenced by someone else.

Ultimately, Crofts notes that approximately three-quarters of the clients who contact her agency with a negative gut feeling turn out to be entirely correct. While the digital tools we use to protect our privacy change constantly, the human desire to put your best foot forward for someone new remains completely unchanged.

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