A friend of mine replied me writing following song title

nobody cheated nobody lied! you'r stupid.
I searched Google and find as follows in Wikipedia This is the title of a song by Duane Steele an award winning country music in 2004.
But is it used as proverb? In which conditions is it used? When a person faces tough conditions or wins a dispute?
A friend of mine replied me writing following song title nobody cheated nobody lied! you'r stupid. I searched Google and ... it used as proverb? In which conditions is it used? When a person faces tough conditions or wins a dispute?

If isn't a proverb, as far as I am aware.
The proper punctuation is "Nobody cheated, nobody lied! You're stupid."

I don't know the song, but I'd understand the title literally:

The relationship has broken up, not because anybody was unfaithful - a typical subject of country soungs - but because the singer's partner was simply too uningtelligent for him.
This interpretation isn't based on anything but intuition as I've been unable to find the lyrics anywhere on the Internet.

Regards, Einde O'Callaghan