Meteoros are "meteors", the rocks that fall from space. It's a very dramatic and unusual word to find in a song about a breakup, making it quite unique.
Jasiel Nuñez uses it in a powerful metaphor, singing that "a nuestro planeta de amor le cayeron meteoros" (meteors fell on our planet of love). This line creates a vivid image of a love that was once a whole world, suddenly and catastrophically destroyed, making it an incredibly memorable and poetic way to describe heartbreak.
This song is about a love that has sadly reached its end. Jasiel Nuñez lays it all out: he's tried everything to make the relationship work, singing, "He intentado ya de todo para que te quedes a mi lado / Y nada me ha funcionado" (I've tried everything to get you to stay by my side / And nothing has worked for me). He's come to the conclusion that his partner's heart is just too cold, comparing it to ice cream in the fantastic line, "Creo que tu corazón es más frío que un helado" (I think your heart is colder than ice cream). Because of this, he's decided he has to leave the love behind.
What makes it so sad is that things used to be good. The relationship didn't just fail; it completely fell apart. He uses some wild imagery to describe it, saying "a nuestro planeta de amor le cayeron meteoros y se acabó" (meteors fell on our planet of love and it ended). Even though he misses his ex, he knows this is for the best. They can't seem to be together without hurting each other, which he admits "suena extraño / Si nos amamos" (sounds strange / If we love each other). It's a song about that difficult choice to walk away from someone you still love because you know you're just not good for one another.