Puth described the "too-loud" guitars as representing an overactive brain that can't sleep due to racing thoughts. Musical Composition
The lyrics "I'm not making the same mistake / Won't be putting my heart on display" refer to past relationship trauma that has made him hesitant to be vulnerable.
The song acts as a message to himself to "quiet his mind" and hide his true intentions to avoid being hurt again.
Charlie Be Quiet! - song and lyrics by Charlie Puth - Spotify
He worries that if his partner realizes how much he loves her, she will "run, run away," leading him to "water his feelings down" to stay safe.
"Charlie Be Quiet!" is a vulnerable pop-rock track by Charlie Puth that explores the of wanting to express deep feelings for someone while being terrified that doing so will drive them away. Meaning and Context