She hadn't expected this.

Fujiko wasn't surprised that he felt jealous. Jealousy was a natural thing, after all. What she hadn't expected was the form his jealousy took. This wasn't just Shirogane wanting all her affections to himself. He actually thought that she wasn't serious about the way she felt about him

"I told you I was serious and I am." She crossed her arms and glared at him. "I'm not sure what made you think otherwise but I only have eyes for you.