While this is true, it depends on many factors one of the main ones is the market value of her BF, trust me if she knows how great of a catch you are, the chances of her stepping out are minimal.
Women don't cheat for variety, they cheat for unsatisfaction. You got boring, she got bored, its not even a relationship, boring routine, or hypergamy(someone better showed up).
This means you AT LEAST, have to be satisfying her in bed. Focused on having your sht together(Money and game) and have set relationship boundaries. And even having all that is no guarantee, like I said before. If she is going to do it, she will do it if someone with higher smv shows up, unless you have a real solid emotional attachment developed like I have with her for a few years.
For all you BP guys thinking that a woman has to be emotionally involved to cheat, this is wrong. All it requires is a bit of alcohol and their true nature reveals.
This is why based on her nights out you determine if that is a red flag to you. A woman does need to be emotionally involved with someone else to branch swing, and have lost respect for you.
This is funny because even though her bff was a 8. i only fked her 5 minutes and told her to get off,while shaming her for doing that to her friend, she bawled and promised not to say anything. This is where I got a huge advantage, by fessing up to my girl the next day, while her bff said nothing about it.
But yeah guys if you do cheat, it's better not to say anything but imply it through being distant, and indifferent/busy. And even if you do it, be prepared to be swallowed by guilt.