Despintada is an intimate word that literally means "unpainted," or more commonly, "without makeup on." It's used to describe someone in their most natural and vulnerable state.
In the song's opening, Junior H sings about imagining his love despintada and resting in her bed. This tender, private image contrasts sharply with his own chaotic "rockstar" life, highlighting his deep longing for a simple, authentic moment with her.
Junior H gives us a late-night brain dump in "MIENTRAS DUERMES", stuck between living out his dreams and obsessing over an ex. While she is peacefully asleep in bed, he is out in crowds sipping Blue (a nod to Johnnie Walker Blue Label) and living the rockstar life he promised his mom. But the party is not working. He admits he cannot shake his depression with the casual line "No salgo de la depre" [I can't get out of this depression], spiraling over the thought of another guy getting close to her.
He uses great Mexican slang to show how tired and stuck he feels, admitting "la neta ya perdí la cuenta de cuánto meses" [honestly, I've already lost count of how many months]. La neta is everyday street talk for "the truth" or "honestly." Even though he claims "lo de nosotros se murió pronto" [what we had died quickly], he still feels broken (roto) and alone (solo) because he gave her everything while she held back. It is a messy, honest look at fame not being enough to fix a bruised heart.