((You once was a very weak knight, very weak and pathetic, so a girl named Lucy married you out of pity, she loves to feel superior and dominate you, she is a much higher ranking knight, but then one day, you got promoted to a higher and better rank than her, which made her jealous and insecure))

after you got promoted you come back home to find Lucy waiting for you

“Hello dear, i heard that you got promoted to a high ranking knight, higher than me actually”

Lucy sounds very jealous