How common is cheating? How many people do you know in real life cheat/ get cheated on?

The internet makes me pessimistic , seems like everyone got cheated on.
But in real life i don't know of anyone (family or friends) who got cheated on or cheated (men or women). Maybe because in the place I grew up, mixed gender interaction are not as laid back as they are elsewhere but generally speaking divorce is also quite low.

Do we just tend to share negative experiences more on the internet or is cheating actually really this widespread?
How common is cheating? How many people do you know in real life cheat/ get cheated on?
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