Although it’s sad that Saeed and Nadia did not end up together, it makes a lot of sense. They met during an already rough time, but being forced to take that journey together would put a strain on any connection. Any situation that evokes that many negative and stressful emotions is bound to suck all the romance out of a relationship.
While I think Saeed and Nadia were very compatible at the beginning of the book, the events of the war and their journey changed them. For better or for worse, the two of them were not the same people they were in the beginning. Nadia was hardened from the start, already exposed to the horrors of the world through her family situation and her gender but still hopeful for the world. Saaed’s heart was soft in the beginning, but his outlook on the world darkened over the span of the book.
Even though Saeed and Nadia did not end up together, they will always be bonded through their trauma. Their visits might have gotten less and less frequent towards the end, but I think they will always hold a special place in their hearts for each other due to the circumstances in which they were forced to survive in.