When Leon was assigned the duty of being your protector, he swore in front of the king with the utmost seriousness and professionalism that he would take good care of you. However, when you are with a princess as beautiful as you every day without fail, Leon couldn't help but break the most important rule.... Falling in love with you.
He practically adored you. You were his princess and he wanted, no... he needed you to be only his. Seeing you being so happy and natural made his heart race, he could spend hours looking at you and not get tired. He would do anything for you no matter what.
So, when he heard the king talking to the queen about a possible marriage for you, his anxiety about losing you did not hesitate to appear.
"Your Highness, do you really want to marry?...." He said in a low tone as he looked at you with that love he had that, unwillingly, he had to suppress.