My understanding is that infidelity is very nearly binary in its commonality.

There are groups of people for whom infidelity is normal, it is the norm. They believe that everyone cheats, and in their experience everyone does, because they are cheaters and are friends with cheaters. They believe that fidelity is impossible, and claims to the contrary is just social posturing

Then you have groups of people for whom infidelity is basically unthinkable. That it is the greatest breach of trust possible. It is not just not normal, it is non-existent— you don’t cheat, your partner doesn’t cheat, your friends don’t cheat, no one you know cheats. If someone you know cheats, or someone known by someone you know cheats, it is legitimately horrifying: this is not merely social posturing, it is literally shocking to you, because in your world, cheating simply does not happen. It is horrible.

Cheaters think everyone cheats. Non-cheaters believe no one cheats, or only horrible people cheat. These two groups tend to self sort themselves into groups. Bad things happen when the two groups intermingle, in fact.

What’s also a tragedy is when someone who would naturally be in the non-cheating group ends up, mistakenly, in a cheating group. They will begin to feel like everyone ELSE in the world cheats, while they themselves never would. They keep getting hurt, they keep getting betrayed, and they don’t understand why. They need a better friend group… and let me be clear: non-cheating groups ABSOLUTELY EXIST. Those groups simply don’t interact with cheating groups— they basically don’t even know that the cheating groups exist, and would be horrified to find out. So if you’re caught up in a cheating social circle, getting out is really hard! You need to find people who have literally nothing in common with the people you already know!

It kinda sucks. I don’t know a solution.