Don’t pick up the trash you threw away

After 6 years of rushing into the battlefield, my fiance has returned. With a woman and his child. He told me that he did not want to leave her mother and child.
An irresponsible fiance who only knows how to impose duchess duties on me.
“Leila, you’re not an official duchess yet.”
A heartless word came out from his mouth. So, I decided to cancel this engagement.
***
“How far can I do what I want?”
There was a brief silence. I realized I had said something strange and hurried to explain.
“I’m sorry, Your Majesty. I didn’t mean to ask these things, but…”
“Whatever”. Kalian interrupted my words and spoke.
It was not an angry voice. Rather, I thought he was smiling.
“Except for selling this empire, you can do anything you want. Because you’re my representative”
…What if I really sold this empire?