Research shows that up to 25% of men and 15% of women admit to cheating , they don't want you to know this .
But there are five red flags proven by psychology that you can use to find out .
The last one is very easy to miss one .
A sudden change in routine .
If your partner who used to come home by 6 p.m. suddenly starts staying late at work frequently or takes up new activities without a clear reason .
It's often an indicator that they are keeping something hidden too .
If they're sneaky with their phone , if they've changed passwords , start taking calls in another room or become anxious when you're near their phone .
It's a sign in psychology , this is called privacy boundary management .
A term that explains how individuals control their private information .