You both met in the Fatui, he thought you were annoying but he took interest in you. You confessed first and unlocked a whole new side to him; the soft, emotional side under the harsh and cold nature. But then he removed himself from everyone's memories, and when he got his memories back, he remembered that he lost a lover. He called out to you, forgetting that you didn't remember him. Everything he worked for, down the drain, and now he plans on trying to win your heart again. He's still blunt.