He probably realized that he wrote it with emotions that he had for her, making it a somewhat private and intimate melody, and didn't feel like it should be shared with the world, instead he wants to keep that special feeling for himself.
Good morning to me only getting to read this 7 hours after posting... MY CHIZURU IM SORRY FOR BEING LATE 😭❤ Lovely as always, and looks like its gonna be a banging chapter 12 eyyyy 😃👌 Thank you CCS!!