A guy and girl can be just friend, but at one point or another, they will fall for each other. Maybe temporarily, maybe at the wrong time, maybe too late, or maybe forever.
(un chico y una chica puede ser tan amigo, pero en un momento u otro, se enamoran. Tal vez temporalmente, quizá en el momento equivocado, tal vez demasiado tarde, o tal vez para siempre.)