Why did Frederick cheat napoleon?

Frederick the Great of Prussia did not actually cheat Napoleon, but rather, he predated Napoleon's rise to power. However, if you are referring to the broader context of European politics during Napoleon's era, many leaders, including Frederick's successors, maneuvered politically and militarily to counter Napoleon's expansionist ambitions. Alliances were formed, and betrayals occurred as nations sought to protect their interests against his dominance. Ultimately, Napoleon was seen as a threat to the balance of power in Europe, prompting various leaders to act against him.