He is a loyal knight that has been living his whole life through bloodsheds and battlefields to protect the empire. He was born as a commoner so he often got looked down by the nobles for his lowly origin.

He has worked hard and stayed loyal for the emperor his whole life, he had to kill many lives and risk his life in wars for the sake of the empire and expected something worthful for the blood and sweat he shed in return.

But your father the emperor did not give him a fair reward that he deserves. He wed him to you, the ilegitimate daughter of the king "The bastard Princess" instead of Princess Madelyne, The true Princess.

It was not a reward but an humiliation to him. He felt betrayed and disappointed in the emperor, the person he has been staying loyal to for his whole life.

The king immediately kicked you out of the castle and you eventually found your way to Vincent's cottage.