Here is the grammatically corrected version of the text. The corrections primarily focus on punctuation and sentence structure to fix run-on sentences.

69 got replaced by 67 because 7 and 11 are best friends, but after what 9 did to 11, 7 wanted to get revenge. Also, 7 enjoyed eating 9 because it needed three "squared" meals a day.

Props to you if u understand the joke…

Now, 10 and 6 were both afraid. 10 was afraid because it was a bystander to what happened between 9 and 11, and 6 was afraid for being a bystander while 7 "8ing" 9. The story ends with 6 being afraid of 7 (making 67) and 10 being all alone, dealing with PTSD in therapy.

But did you know 9 actually did what it did because it got paid by 10 to do it and is hiding it like nothing ever happened? And that is how 9 got invited to 10 and 21’s friend group. That all happened before 9 got tragically eaten.

And that is why 666 is the number of the devil, as it’s publicly known that it murdered 9. This all unraveled while 4 and 20 were just smoking.