I think its because he had always loved Aeroc but couldn't since Aeroc was an alpha at the time. And he only went for Raphiel since he's an Omega and looked identical to Aeroc.
It's just the generic aaah rapist to lover Stockholm syndrome. I'm surprised the hospital didn't look for him, terrible reputation (Yes) but a doctor nonetheless. ( ´ー`)
LINK TO RAWS??
i second this