Blaise noted that Millicent's voice wasn't holding it's usual cut even though her words were just as to the point as they always were. In response he used a simple matter of fact tone, "Then you should know well enough that I tend to keep such things to myself." He didn't continue with the fact that if he were to speak of things Daphne would be who he would chose to open himself up to.
"Well Miss Bulstrode," he twirled his wand with his fingers impatiently, "who would you suggest I speak to if I were to decide to do such a thing?"