Marea literally translates to "tide", as in the rising and falling of the sea. It's a beautiful, poetic word that isn't common in everyday conversation.
In this song, the singer is overwhelmed by sadness, pleading for his love not to leave. He expresses this by singing, "Me pierdo en la marea" (I get lost in the tide), creating a powerful image of being lost and adrift in a sea of his own emotions. Learning this word helps you understand how Spanish music often uses nature to describe powerful feelings.
This song by the US band Intocable is a straight-up, desperate plea to a lover who is walking out the door right now. There's no looking back on a past heartbreak here; the singer is in the middle of it, asking, "Porque me dejas / Ahora" [Why are you leaving me / Now]. He's completely in shock, telling his partner he loves them too much to just forget them in a few hours. It's so dramatic, he feels like his very soul is ending.
The whole song is a desperate attempt to stop the breakup from happening. The singer flat-out refuses to accept it, saying, "Eres lo que amo / Y no acepto / Que te vayas" [You are what I love / And I don't accept / That you're leaving]. He begs them not to be cruel and pleads for the return of "El fuego de tu pasión" [The fire of your passion]. It's a powerful and emotional song built around that simple, repeated cry: "Pero no, no te vayas" [But no, don't go].