"It's the same with you. If I could have cured you of this Dolohov Curse without you knowing, you'd never have had cause for alarm about it. And I didn't tell you about maybe being a Horcrux Protector, because I don't know how to undo it yet and I don't want you worrying about what it might do to you. But I will solve these problems, and any others we might have, and when I'm sure the knowledge wont needlessly hurt or upset you I'll tell you about things ... I just don't want to be any cause of pain for you.