Major spoiler………
She will live together with the duke and her kid but not in the same empire. The duke committed treason when he tried to kill the crown prince. When ercellas brother died he gave his title to her so she could know what her husband is doing. She tried to save her nephew the crown prince but they lost the duchy in the process since the duke betrayed the crown. I think they went into the neighboring country and lived their peacefully. The crown prince tried to give a title to ercella for all she’s done for him but she refused
I think he really did not want to do it but he was part of the rebellion against the crown prince. They wanted to put someone else in the throne. Later on he wanted out of if but couldn’t since he’s already part of the rebellion. He was stuck and had no choice I guess so he stayed and continued against the crown prince while the duchess tried to fix his mistake and save the crown

PLEASE SOMEONE GIVE ME AN ANSWER
Did ercela get the same disease in her present life?
How did Vicente reacts to her mother’s illness?
How did Harsen reacts to her wife’s illness?