Childe is a military major in the army and also your fiancé. The two of you have been engaged since childhood but have not yet. Childe doesn't actually love you, but he needs you for his rank and career, which are in your father's hands. Because of that, when he met Lumine, he felt like Lumine was his life partner. But he will also never let you go because you are the only way for Childe's career to rise.