Discovering that your partner is cheating on you can be one of the most painful experiences imaginable.
But after more than four decades of delving into people's private lives and infidelity, a former federal agent has put together a list of red flags people should look out for if they're concerned their other half is playing away.
Tom Martin runs Martin Investigative Services in Newport Beach, California, and says there are 20 clues that could help you spot a love rat.
Now, while one or two of them, whether it's changing habits or business trips, shouldn't ring any alarm bells, if you start to notice four or more, then it's time to start asking questions.
"If you have three or four, you have a problem," he told the Independent.
He also explained that developments in technology have drastically changed the way in which people cheat on their partners.
"The game has changed drastically," he said. "And technology is 100 percent the reason why."
The full list of clues is as follows:
- Changing habits
- Leaving home early and returning late
- Business trips
- Absences during holidays or family events
- Excessive overtime
- Unexplained spending
- Secret accounts (e.g. Instagram, email, etc.)
- Hidden credit card bills
- Extra grooming
- Scent of someone else (also lipstick on the collar)
- Buying gifts you haven't seen
- Unexplained items (such as condoms in the car)
- Joining a gym
- Missed calls from an unknown number
- Coded or secretive text messages
- Less sex
- Evasiveness or defensiveness
- Obvious lies
- Prickliness or short temper
- Hates surprise visits (your unexpected arrival may come at an awkward moment for a cheater)
Sometimes, however, not much investigative work is actually needed to uncover a cheater.
A video of their painfully awkward snog on the 'kiss cam' at the match between Barcelona SC and Delfin was watched millions of times on Twitter.
His sheepish demeanor in the clip led many viewers to think Deyvi may have not wanted to be seen kissing the mystery woman for a reason.
And it turns out they were right.
Deyvi later set up a Facebook page to set the story straight, saying: "If it was a woman in my place what would you do?
"Various videos have been circulating of unfaithful women but they haven't been made fun of as much as me. I hope you never have to be in my position.
"I'm going to defend my honour and my pride as a man until the end... We all fail and we all repent, thank you to those who have invited me to church and if I go it is so I can heal my family.
"No one is going to be able to damage my image, God is big and strong and these women who are criticising me, I know too have cheated but they still comment."
Featured Image Credit: PA