To be fair, her body's former occupant was a scheming piece of work,. and the transition between that body's personalities wasn't only abrupt, but she barely had time for the changes in her to register with him before she was--whoosh!Gone, so it would be hard for him to accept anything she says at face value. Irritating, but ╮(￣▽￣)╭
Her original body was though- like she was a fucking yandere in the original text and right before she teleported to the body the host was trying to murder him so only she could have him. It's understandable that after years of her only personality trait being "I want you to be mine" that he would be confused.
That ex every time we see him he keeps talking about himself . So narcissistic. He deosn't even see the look on her face that she's not interested or how she was looking to oraboni all shy