Why does Cherubino hide in the Countess’s closet?

In the second act of Mozart’s The Marriage of Figaro, Cherubino hides in the Countess’s closet to avoid being discovered by Count Almaviva.

At the time, Cherubino is in the Countess’s boudoir being dressed as a woman by Susanna as part of a plan to deceive the Count. When the suspicious Count suddenly bangs on the door, Cherubino panics and dives into the closet to conceal himself. His presence there creates a tense situation, as the Count becomes convinced that his wife is hiding a lover, leading to a series of complications and misunderstandings that drive the plot of the act.1