The song "Fuiste Tú" by Jay Wheeler tells the story of a relationship that is affected by jealousy. The lyrics imply that the narrator's partner constantly mentions another person, and the narrator starts to get interested in this person and learns about them. However, the jealousy and obsession from the partner begin to poison their own relationship. The chorus suggests that the partner's excessive jealousy is what is causing their issues, and it is the reason why their relationship is on the verge of falling apart. The narrator expresses their frustration with the constant fights and lack of trust, indicating that they have become tired of the partner's toxic behavior. The verses emphasize the narrator's attempts to assure their partner that they have no intentions or feelings for the person they were originally jealous of. The narrator tries to make it clear that their commitment lies solely with their partner. However, their partner's jealousy continues to persist, leading to the deterioration of the relationship. Overall, the song highlights the destructive power of jealousy and the negative impact it can have on a relationship. It portrays a story of two people who struggle with trust and communication, ultimately leading to the potential end of their love.