
They should stop comparing her to him .... hes gonna hate her more... they know the prince's personality ...why that aunt still need to mention and compare them ... tsk

They may think that he is proud that his fiancé is so talented and qualified to be his wife and the future queen. We know he doesn't like her because we know her past-future and their interactions, but the characters as the King and the aunt don't know that yet and think that he's an arrogant kid whose nose grows with every complement.
I know the king is a very bad person and I still dont get it why they need to kill our MC when she was a prince ... she hasn't done anything.....
This happens quite often historically. Killing off any kin from the previous ruling figure assures the new family in power that there will not be any uprising in support of the previous family. It avoids unecessary future wars for the throne.
There might b supporters of the previous king in their kingdom who would rather serve the prince(ss?) instead of the new king. it can cause a rebellion