Responses

In this case, it's not because they're really in love with the Duke. What they really like is the position of Duchess (power, wealth, prestige), it's just a bonus that the Duke is young, handsome, and decent person. They think that because they're beautiful/high social status that the Duke should automatically love/choose them.
Thh I don't understand people that get angry when person that they love is with someone. Like If you ask me if person that I love has someone that loves them back I'm hurt but happy for them. It happened to be already once so I don't get why people would hurt a person that your love loves....that's basically hurting person you love