In "Sweet Nothing" by Jeff Bernat, the singer reflects on a moment where he made a mistake by trying too hard to impress someone. He regrets not keeping his thoughts to himself and being too honest, which may have led to the end of their relationship. The lyrics describe the awkwardness of being in a situation where there is silence and tension between two people, hinting at the possibility of a breakup. The singer wishes he could turn back time and take back his words, but realizes that it may be too late. Overall, the song conveys a sense of regret and longing for a second chance at salvaging the relationship. It captures the complexity of human emotions and the consequences of not thinking before speaking in a romantic relationship.