Responses
Like I'm currently rereading and in Chapter 36 there's a letter from a young lady saying 'your passion of waiting outside of my window frame all night until the morning dew falls has mysteriously vanished' really tells that Cesare only behaves like that when he hasn't gotten the lady's heart yet. If he had gotten what he wanted, he left them to find another 'quest' to be conquered. Remember that Cesare wanted to have Isabella's heart too until he found out about her flaws and Ariadne entered the picture.
Oh yessss! Great observation!
That's how Ariadne was fooled. If this is the intention of the artist (to show how someone could be fooled by a manipulative abusive cheating bastard) then they did well.