Unless you spend every hour of every day with your partner it can be impossible to keep track of their every movement.
But if you suspect infidelity there are a number of body language signs you can look out for.
Author and body language expert Judi James has offered Express.co.uk some of the clues which may indicate a man has cheated.
1. Alpha male combined with guilt signals
There is something about the body language that will almost be a boast.
You may see a bit of chest puffing, a little more of a swagger and a kind of suppressed smiling. But that will be interspersed with feelings of guilt. So you might also see a quite high stress level response, things like fiddling, looking distracted and sweating even.
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So it’s kind of alpha male combined with guilt signals and anxiety rituals.
2. The mobile phone
You’ll see a lot to do with the phone. The phone will be the main line with their new partner. Whereas normally perhaps they’ve left it lying around, suddenly it’s aways hidden away somewhere. If it suddenly rings they will leap up like a scolded cat.
They suddenly become very polite. If you’re watching television they’ll go out of the room to take phone calls.
They’ll want to know where it is all the time, keep picking it up when it rings and if you go anywhere near it they’ll almost rugby tackle you.
3. They suffer from memory loss
Women might make up a friend but men suddenly lose a friend when they’re cheating.
They’ll be someone at work they’ve been taking about a lot and then suddenly they disappear. You say to them ‘how’s Christine at the moment’ and they say ‘who? I can’t remember who they are’. That usually means they’re worried their facial expressions are going to give them away. If they suddenly remember that person they’ve had an affair with they’re going to look really guilty so they pretend not to know who you’re talking about.
4. New body language traits
When we are cheating on our partner or in a new affair we tend to mirror and pick up on a lot of their body language. So you’ll suddenly see a change in the body language and often a change in the dialogue – words they wouldn’t normally use, a change in music that they like.
With body language you’ll see new facial expressions and they might extend to the bedroom as well.
Rather than going off sex because they’re in a state of sexual arousal generally, they’ll be more into sex and suddenly try new things, and that’s the point to think ‘I wonder who they learnt that off’.