Te tardaste literally translates to "you took too long" or "you were late." It's a common phrase, but in this song, it carries a deep emotional weight that makes it particularly impactful.
The singer uses it to tell his ex-lover that her realization of wanting him back came too late. He has moved on and found someone new, emphasizing the irreversible consequence of her delay. This phrase perfectly encapsulates the song's central theme of missed opportunities and the finality of time.
Río Roma's