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.
Texas group Intocable brings us a classic breakup panic with "No Te Vayas" (Don't Go). The narrator refuses to accept that things are over, flat-out complaining that you cannot simply wipe out deep feelings in an afternoon: "Te quiero demasiado / Para olvidarte / En unas horas" (I love you too much to forget you in a few hours). He treats the departure as an act of deliberate cruelty, straight up begging, "No seas cruel con mi corazón" (Don't be cruel to my heart). It is dramatic, desperate, and completely unapologetic about pleading for another chance instead of keeping his dignity intact.
He piles on the melodrama with big, stormy imagery. He claims, "Me pierdo en la marea / Y mis lágrimas se acaban" (I get lost in the tide, and my tears are running out). You can almost hear him throwing his hands in the air when he admits he has run dry of tears while drowning in his own emotional sea. Instead of moving on gracefully, he craves the heat back in his life, crying out that he needs "el fuego de tu pasión" (the fire of your passion) so he is not left holding "un triste adiós" (a sad goodbye).