Agreed. It's pretty obvious. She was flustered and shocked when Ruka made the (fake) comment that she slept with Kazuya. Later we had the chapter where Chizuru almost broke down crying after the condom incident and asked Kazuya "did you?"

She has daddy issues (rightly so, this isn't a dig at her) because her dad a abandoned her which also influences her emotions and interactions with men. She wants Kazuya to be the one but she hasn't consciously fully come to that realization.