"Let Me Know" is a song about communication and honesty in a relationship. The lyrics describe the frustration of feeling like your partner isn't listening or being distant, but also the importance of being open and sharing your feelings. The chorus repeatedly asks for the other person to let them know if they're too much, too drunk, or acting up, signaling a desire for clarity and boundaries. The verses alternate between Drew Love and Lauren Jauregui, expressing their individual perspectives on the relationship struggles they're facing. The bridge acknowledges that both parties are responsible for their behavior and need to take ownership of their communication issues. Overall, "Let Me Know" is a plea for transparency and mutual effort in maintaining a healthy relationship.