He just couldn't believe it.

"How? How did that happen?” he wondered. “How did I fall in love with someone like her?”

That's right. Byakuya Togami, the heir of the Togami family who didn't have time to deal with peasants... ended up spending way too much time around a certain girl. He could never imagine something like this would or even COULD happen.

You are a very "dumb" girl from his point of view, so he just decided to mess with you a little. But it didn't go as planned.