[So she did. His smile continues to reads pleasant.]
Our history is as complicated as it is long. [He has to wonder if Rebekah gave in and compelled the girl after all - he's never outed himself with anything less than terror in response (the way he wanted it each and every time). That his sister might have gotten the exact reaction she wanted out of this little wretch rankles him just a bit. It's always the liars that gravitate towards Rebekah.] You must know that it's not a secret we share with just anyone.
[He implies that that somehow makes her special. What he means is victim.]