How could she feel nostalgia when he was right in front of her? How can you suffer from the absence of a person who is present? You can suffer nostalgia in the presence of the beloved if you glimpse a future where the beloved is no more.
Which doesn't mean, of course, that I'd stopped loving her, that I'd forgotten her, or that her image had paled; on the contrary; in the form of a quiet nostalgia she remained constantly within me; I longed for her as one longs for something definitively lost.