The song "No One Needs To Know" by Haerts is about a secret and forbidden love affair. The protagonist has a hidden relationship with someone, and they share intimate moments together. However, this relationship is a secret, and the protagonist cannot share it with anyone. They hold a heavy treasure in their chest and cannot confess to anyone. Despite their feelings, the other person in the relationship has never tried to truly know or understand the protagonist. The relationship is emotionally charged, and in the heat of the moment, the two share a little cry. However, they know they can never speak about it, and the protagonist is willing to take this secret to the grave. The lyrics reveal a sense of raw vulnerability and the weight of keeping a secret. The protagonist wants to share their feelings and cherish their moments with the other person openly, but they cannot due to the circumstances. Ultimately, "No One Needs To Know" is a heartbreaking song about a love that cannot be shared with the world.