National Cheat on your Bitch Day, also known as National Cheat on your Boyfriend/Girlfriend/Hoe Day, is September 17. This is the day where you become a terrible person and cheat on your significant other, or your side-chick.
Savannah: Why did Luke Hemmings cheat on my mother?
Breanna: Because he didn't wanna take care of his children. And wanted someone much prettier.
Basically gives us why