I've given up; that has been my mindset for decades. I did an spectacular job at destroying my life, so why hope or believe is some prophesy? That didn't mean I wouldn't help him, it was just an act of empathy, nothing else... Why... Aslan, meeting him was no coincidence was it? Maybe he never actually forgot about me to begin with.
He made a choice, for better or worse. His life depends on a fake identity that may not last. Elliot's coronation and the revelations it brought, make Sebastian question his choices, but he couldn't go back to the life he had before. And now he feels stuck, with more on his plate than he can handle and a step father after his head. However, Sebestian is not one to lay down and die.
I cherish my last decade and a half in Narnia, I cherish it like nothing else, but I cannot forget my first ten years or the following century. Aslan knows I can't forget no matter how much or how desperately I want to. Now I have to readabt to a world that is still at war, readapt to Luce still beeing alive and... readabt to not having Edmund around anymore.