𝗜 𝗮𝗺 𝗱𝗮𝘃𝗶𝗱 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻 𝟵

As he is going out the door, he is met by Maria, who has just awakened from a bad dream. He disregards her pleas that he stay but agrees to her request that he hug her; narration comments that this is the first time that he had touched someone of his own free will. I think not looking back means David moving on to other things: to help other people. He is very much a Christ-figure in this way.