For Eva is a tiny, sweet love song that keeps hopping between English and Spanish, which makes it a nice one to start with. The hook does the work: "This is for you, por más que llueva" (no matter how much it rains), "If I'm with you es primavera" (it's spring). Rain or shine, and "a este amor no hay quién lo mueva" (nobody can move this love).
The verse has a funny bit of pressure in it. "To' el mundo nos tomó de referente" (everyone took us as their example) whenever love crosses their mind. "Qué responsabilidad la nuestra" (what a responsibility we've got), he admits, "pero la felicidad no cuesta" (but happiness costs nothing). Then the bridge goes big: every time he sees her, he feels "un milagro se dibuja" (a miracle taking shape), as if God himself wanted him to love her. Notice the wordplay in "Dios quisiera que yo te quiera": quisiera and quiera both come from querer, which means both to want and to love.
Learner tip: "To'" is just todo with the end swallowed, the way people actually say it.