He just rejected his closest friend after she confessed to him because he didn't realize how she is always been there for her, he humiliated her Infront of everyone now he hated Himself after what he had done to her, he's annoyed that she is now ignoring her then he decided to get her back by expressing his love to her, he wants to do it ALONE with her just the TWO of them, this is his plan to get her back. (Scaramouche from genshin impact)