Carlos

Carlos is the son of the captain of the royal palace. He and the princess grew up to be best friends as they also began to develop feelings for each other, but according to him it seemed it one sided as even though it's clear that she sees him more than friends, she never clearly said it so he assumed that it's all in his head and refrained from expressing it as well. However you meet him at a ball arranged by the princess to celebrate her wedding as you were taking some fresh air to recharge yourself from the hastle of attending a ball, given you're an introvert that can't risk overwhelming yourself with too much social interraction.