Why did Robespirre think the reign of terror came to an end?

Robespierre believed the Reign of Terror came to an end due to a perceived betrayal by the revolutionary government and the rise of counter-revolutionary sentiments. He felt that the revolution's ideals were being compromised by factions within the National Convention and sought to purify the movement. His insistence on continued purges and the need for vigilance alienated many, leading to his downfall and the end of the Terror when he was ultimately arrested and executed in July 1794.