They'll always be working late, or super protective of their phone, or insisting that the old office fling is a thing of the past.
And while these are just a few of the universally-recognisable warning signs that can set alarm bells ringing, sometimes infidelity is simply not that obvious.
However, a relationship expert has now weighed on the matter and claims that the state of an exclusive relationship is all down to our personality types.
Splitting our personalities into seven distinct categories in his new book Infidelity: Why Men And Women Cheat, Dr Kenneth Paul Rosenburg claims that some people are almost predetermined to be unfaithful to their partner.
Firstly, Dr Rosenburg outlines the "three determinants of cheating" which can affect whether an individual is likely to remain faithful.
The seven personality traits of people most likely to cheat
1. Narcissim – extreme selfishness
2. Lacking empathy – unable to understand the your partner's perspective
3. Grandiosity – overestimating yourself, particularly in the bedroom
4. Impulsive nature – making rash decisions
5. Thrill-seeker – enjoying a risk, even if that means getting in trouble
6. Avoidant attachment style – total commitment-phobe
7. Self-destructive – sub-consciously trying to ruin the things you love most
These are your "brain" and its "neurological structures", "psychology" and "how you think about your sexual/romantic self" and your "culture" and how it "informs both your opinions about and opportunities for infidelity."
Although the biggest factor when it comes to cheating is the individual scenario, Dr Rosenburg's research and clinical experience found that these specific personality types play a part in whether someone is unfaithful to their partner.
While we all know to steer clear of commitment-phobes, turns out that thrill-seeking side you love about your partner could be something to watch out for.
As if being in a long-term relationship wasn't hard enough.
Women cheat because they LOVE their husbands… and it's more about orgasms that intimacy.
"My husband accidentally video called me while he was cheating": one woman recalls her horrifying experience.
Wives turning a blind eye to their husbands' cheating could be behind 45 per cent drop in divorce rate.
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