Meaning of Yesterday, I found out about you

In Taylor Swift's emotionally charged song "Should've Said No," the lyrics delve into themes of betrayal, regret, and the consequences of one's actions in a relationship. The line "Yesterday, I found out about you" serves as a pivotal moment in the song, as it signifies the discovery of infidelity and the subsequent emotional turmoil experienced by the protagonist.This line introduces the theme of revelation and knowledge. The word "yesterday" implies a sudden shift from ignorance to awareness, suggesting that the protagonist had been blissfully unaware of the betrayal until recently. The word "found out" carries a sense of shock and disbelief, emphasizing the impact of this newfound knowledge. It conveys the profound effect that this revelation has on the protagonist's emotions and serves as a turning point in the song's narrative.Furthermore, the line evokes a sense of deception and secrecy. The word "about" implies that the protagonist stumbled upon the truth unexpectedly, reinforcing the notion that the betrayal was concealed. This theme of deception highlights the breach of trust within the relationship and underscores the pain and disillusionment the protagonist experiences upon learning about the infidelity.The line also explores the theme of realization and reflection. The mention of "you" suggests that the protagonist discovered the infidelity in relation to their partner, emphasizing the personal nature of the betrayal. This discovery prompts the protagonist to reevaluate their emotions and perceptions. The phrase "even now, just lookin' at you feels wrong" demonstrates the internal conflict faced by the protagonist, as they struggle to reconcile their feelings for their partner with the newfound knowledge of their betrayal. This introspection adds depth to the theme of regret and self-reflection within the song.Overall, the line "Yesterday, I found out about you" contributes to the powerful themes of revelation, deception, and realization in "Should've Said No." It marks a significant turning point in the narrative, exposing the pain caused by infidelity and igniting a journey of self-discovery and contemplation. Through this line, Swift captures the intense emotions and consequences that arise when trust is shattered and reminds listeners of the importance of communication and honesty in relationships.