Adding to what I said - I think "still you hold on, as the light is fading out" means the girl is desperate for the relationship to continue but it is fading out fast. The "lustre" from her eyes is the longing for the guy to restore it. The relationship is ebbing and decaying away as the guy feels he has to move on.
The pulsing in her veins is her desire to be with him even after he's broken up with her.
Adding to what I said - I think "still you hold on, as the light is fading out" means the girl is desperate for the relationship to continue but it is fading out fast. The "lustre" from her eyes is the longing for the guy to restore it. The relationship is ebbing and decaying away as the guy feels he has to move on.
The pulsing in her veins is her desire to be with him even after he's broken up with her.