Marchitar means "to wither" or "to fade," often used for plants or flowers losing their freshness and vitality. It's a more evocative and less common verb than simply saying something ended.
In the song, the lyric "Con una mentira hice marchitar la primavera" (With a lie, I made spring wither) uses this word metaphorically. It powerfully conveys how a single lie destroyed a beautiful, flourishing period, much like a flower wilts and dies, making it a memorable and impactful choice.
"Maldita Apuesta" ("Damn Bet") is about the regret of walking away from a relationship the narrator thought they no longer wanted. They call it a bet, one they overplayed, and now they are paying for it: drinking through the nights, haunted by memories that still smell like the person they left.
They tried to move on with someone else, but it never felt like love, it just left them more lost. The chorus keeps circling back to the same question: why did I leave? It is less an answer than an admission that they already knew, deep down, that the relationship was worth keeping.
The song repeats its verses almost exactly the second time through, which fits the mood: the narrator is stuck replaying the same regret on a loop, unable to move past the moment they made the wrong call.