Lucero literally translates to "bright star" or "morning star." It's a beautiful and poetic word often used to describe something or someone exceptionally bright, radiant, or guiding.
In this song, the artist uses lucero to refer to his beloved, calling her "Tú mi lucero, mi reina y mi diosa" (You my bright star, my queen, and my goddess). This highlights her importance as a guiding light and a source of hope in his life, making it a memorable and endearing term of affection.
"Alma Rota" is a bachata about being wrecked by someone who is still, technically, around. The first line sets it up: "Voy por la calle con el alma rota" (I walk down the street with a broken soul), and then, almost irritated, "Dime si acaso es que no lo notas" (tell me if maybe you just don't notice it). He piles titles on her, "Tú mi lucero, mi reina y mi diosa" (you, my shining star, my queen, and my goddess), and keeps the smallest part in the story for himself: "Y yo tu títere" (and I, your puppet).
Then it gets dramatic, in the way bachata is allowed to be. He takes the question to church: "Le pregunté a la Virgen María / Que si tu vida y la mía sería" (I asked the Virgin Mary if your life and mine would be one). The chorus is the blunt part. "No puedo evitar lo que siento / Me está matando lento" (I can't avoid what I feel, it's killing me slowly). And every verse lands on the same turn: "Y tú me salvaste y ahora te marchita'" (and you saved me, and now you wither away). The person who pulled him out is the one fading.