Compito means "I compete" or "I contend". It's the first-person singular conjugation of the verb competir.
In the context of this song, the artist sings, "Que yo no compito en nada con él" (That I don't compete in anything with him). This line is particularly striking as it conveys a sense of dignity and moving on, refusing to engage in rivalry over a past love. It's a powerful statement of self-respect and emotional maturity, making it an engaging and memorable word that stands out from typical romantic song vocabulary.
This song feels like a late-night message to an ex. Rels B starts by admitting that things have changed since they were together. He says, "Claro que he cambiado y tú, también, mi amor" (Of course I've changed and you, too, my love). He's accepted it, but he's not sure if she has. He wonders who she's with now, asking, "¿Quién se estará llevando tu luz?" (Who is taking your light now?).
Even though she said she wanted to see him succeed, he feels her absence now that he has. He sings, "Hay cosas que no pude celebrar, tanta gente y tú no estás" (There are things I couldn't celebrate, so many people and you're not here). Then he gets a little more direct, telling her to pass a message to her new partner: "dile al nuevo que de mí deje de hablar" (tell the new guy to stop talking about me). He insists he's not competing with anyone, and ends by acknowledging they both have healing to do, repeating that his own heart needs fixing, too.