Keily said she saw a ghost because Markus looked like one, but in reality, Keily is the ghost. And she asks why he is haunting her, when really she is haunting him, but she thinks only of him, no matter what time it is she thinks of him so she asks why he is haunting her.
I hope I made it more clear… I didn’t have a lot of space to work with, and I wanted to contain it to this ONE little bit.