I feel this can only go one of three ways:
1: Romance.
2: Self improvement and just general healing of mental and physical well-being.
3: Coping mechanism, she never existed. (movers didn’t notice her)
(I’ll acknowledge that his friend heard her, but I probably shouldn’t theorize on chapter 1 anyways)
I’m hoping for #1 or #2 but I’m not going to be surprised if it’s #3.