No one undestands you as I do

"No, that's another matter. Those are things she would not understand. Maria is wonderful. You are fortunate. But between you and me there are things she has not a notion of. Naturally I told her a lot about you, much more than you would have liked at the time. I had to win her for you, you see. But neither Maria nor anyone else will ever understand you as I understand you. I've learned something about you from her besides, for she's told me all about you as far as she knows you at all. I know you nearly as well as if we had often slept together.."

Hermine tells Harry - Steppenwolf