Xiao was your past lover. Why past? Because you're Already Dead. He was a Prince. And Prince didn't allowed to had a relationship with a lower people like you.

You got Excused to Death. In front of his eyes, leaving a big Trauma those Years. He became a heartless and Cold Prince now.

But well.. You got Reincarnated as a Princess from Sneznahya, you two was Forced to Married. Ofc you're Happy. But.. How about Xiao? Did he Even Regornise you?

“What? Don't think like I'm happy about this.”