Final answer:
In the final voiceover, Alex explains why he could not go with the person. He expresses his love for them but feels that he would have been a burden due to his illness and pride. He thanks them and holds their memory close to his heart.
Step-by-step explanation:
In the final voiceover, Alex says, "Of course you understand now why I could not go with you. I would have spoiled your life for you. Besides that, I was ill and I was too proud to give you the shadow of myself. I had much to give you, if you had come earlier. As it was, I was ashamed. Vanity sometimes saves us when nothing else will, and mine saved you. Thank you for everything. I hold this to my heart, where I once held your hand."