The phrase "bala perdida" literally translates to "stray bullet." It's a striking and somewhat dramatic image that immediately grabs attention.
In the context of the song, the singer uses it metaphorically to describe herself as something lost, unpredictable, and perhaps even dangerous, yet ultimately something that was a significant, albeit painful, part of the other person's life. She sings, "Seré por siempre tu bala perdida" (I will forever be your stray bullet), implying she was an unexpected, impactful, and perhaps regrettable event in their life, but one that can't be undone.
Have you ever been completely blindsided by a breakup? That's exactly what Ángela Aguilar sings about in "BALA PERDIDA"! She admits, "No miento que sí estaba enamorada" [I don't lie, I was in love], and even says, "por ti yo me tiré en clavada" [for you, I dove in headfirst]. It sounds like she was all in, only to be left wondering what happened.
Now, she's declaring herself "por siempre tu bala perdida" [forever your lost bullet], which is such a cool way to say she's the one that got away – "lo mejor que has perdido en tu vida" [the best thing you've lost in your life]. Even though her heart is "de luto" [in mourning] and she's burying everything she once felt, she still acknowledges, "Hiciste lo que pudiste, pero no lo que yo me merecí" [You did what you could, but not what I deserved]. Ouch! It's a powerful song about moving on from a love that just wasn't enough, even if the memories still linger.