Marchitándome comes from the verb marchitar, which means "to wither" or "to fade away," just like a flower that's past its prime.
In this heartbreaking song, Dread Mar I uses this powerful image to describe his emotional state. He sings, "Marchitándome estoy si sigo pensando así" (I am withering if I keep thinking like this), to express how the sadness from the breakup is causing him to lose his vitality and fade away. It’s a beautifully poetic word you won't find in a typical textbook.
This song is one of the most direct breakup songs you'll ever hear. Dread Mar I, a reggae artist from Argentina, doesn't waste any time. He opens with, "Siéntate, te quiero hablar" (Sit down, I want to talk to you), and then immediately drops the bomb: "Es que te dejé de amar" (It's that I stopped loving you). There's no gentle lead-in; it's just a blunt, honest statement about the end of a relationship.
The chorus is a powerful and repetitive declaration that things are over for good. He sings, "Nada, nada volverá a ser lo que fue" (Nothing, nothing will go back to how it was), calling the past "puras ilusiones" (pure illusions). He seems to be telling both his ex and himself that it's time to accept that the love they had "fue ayer" (was yesterday). It's a sad song, but it's also about the strength it takes to finally admit a difficult truth and move on.