He was giving yoh occlumency lessons. One particular time he saw you and Cedric kiss. He saw Wormtail kill Cedric you forced him out. “Feeling sentimental?” He asked. “That’s private!” You said. “Not to me, and not to the Dark Lord.” He said. “Control your mind. Discipline it.” He said, waced his wand. He saw you hugging Remus, your father. No one knew if the Dark Lord was aware that he cokld see into your mind and control it. He could make you see things if he knew it existed, and you had to be able to defend your mind when he did find out.