Seeing them side by side and with all his accomplishments, I'm starting to wonder about the age difference....
Not really that fond of the male lead, there is absolutely a thing where you don't share to much about yourself. But he is taking it too far and just comes off as a pile of caca. How is she supposed to fall for you if you don't tell her about yourself or show her who you are. This only comes off as him marrying her for the duke title.
Hope you find true love princess, the marquees and the duke daughter can end up together instead.