Tesoro translates to "treasure". While it can refer to literal riches, it's often used metaphorically in Spanish to describe someone or something extremely valuable and cherished.
In the song, the lyric "No voy a olvidar que fuiste para mí un tesoro" (I won't forget that you were a treasure to me) beautifully conveys the deep affection and high regard the singer held for the person, even as they part ways. It's a warm and endearing term that adds emotional depth to the farewell.
This is a breakup song about choosing to leave rather than stay in something that keeps hurting both people. The singer admits she might be wrong to go, but staying feels like the bigger mistake, since it only causes more damage the longer it continues.
She wants the freedom to be herself, even if that disappoints the other person. The relationship feels unequal: she gives more than she gets back, and she is done pretending otherwise.
A spoken moment between Marcela Morelo and Diego Torres breaks up the song, a quiet acknowledgment that this is simply how life goes sometimes. This reggae-styled version leans into that relaxed, resigned tone, closing things out with a soft goodbye.