Culpable translates to "guilty." While it might seem like a common word, its use in a romantic context here is what makes it interesting and unique.
Christian Nodal uses it playfully and passionately, singing "Eres la culpable de estas ganas" (You are the guilty one for these desires). He's not accusing his beloved of a crime, but rather crediting her with inspiring his intense feelings and obsession, turning a word usually associated with wrongdoing into an expression of deep affection and admiration.
In his song "Eres," which translates to "You Are," Mexican artist Christian Nodal sings a passionate and poetic love letter. The entire song is a list of everything a special person is to him. He describes her as the cause of an "obsession that never ends" and the "perfection" he had been waiting for his whole life. For him, she is a guiding light, like a "star that doesn't go out."
Nodal uses beautiful metaphors to express the depth of his feelings. He calls her the "painter of my feelings" and the "writer of all my stories," showing how she has completely colored his world and become the center of his life's narrative. His love is all-encompassing; she is both the "biggest and the smallest" thing to him, and being without her is described as "hell." It's a powerful declaration of finding the one person who is everything you've ever wanted.