Why did the third estate leave the estate General?

The Third Estate left the Estates-General in 1789 due to their frustration with the voting system, which favored the First and Second Estates, leading to their consistent marginalization. They sought to establish a more equitable representation, demanding a single legislative body where votes would be counted by head rather than by estate. This culminated in the formation of the National Assembly, where they aimed to assert their influence and push for reforms in the face of the monarchy's resistance. Their departure marked a significant step toward the French Revolution.