Deslumbrar means 'to dazzle' or 'to blind' (with light or beauty). It's a vivid verb that goes beyond simply 'seeing' or 'attracting'.
In the song, Paulina Rubio sings, "Yo sé que en este tiempo te dejaste deslumbrar por algo que no era más que una novedad" (I know that during this time you let yourself be dazzled by something that was nothing more than a novelty). She uses this word to imply that her partner was temporarily captivated by something superficial, suggesting a powerful but ultimately fleeting enchantment.
Have you ever wanted a second chance with someone special? In "Volvamos A Empezar," which means "Let's Start Again," Mexican pop star Paulina Rubio sings a powerful plea to a lover. She believes he has been temporarily distracted by something new, which she calls a mere "novedad" (novelty). She is patiently waiting for him, confident that this new thing's shine will fade and he will regret leaving.
She reminds him of their deep and unique connection, describing them as more than just a couple: they are "amigos, cómplices y amantes" (friends, accomplices, and lovers). Their relationship has a real "historia" (history), and she feels it's too strong to let go. With sincerity and hope, she asks him to come back, insisting it's not too late for them to start over.