I'm sorry to say that Don Gabriel is very much alive at the moment. And depending on who you ask, he is a Castille spy, an arsonist and murderer or someone with a taste for children.
click for letter
The kitten is Lucia's. More or less. She found it in her bedroom, carrying a collar with the ring Lucia wanted to get her hands on when we fought El Gato and a letter: "Since you seemed so interested in this..." Uh oh.
Marcello channelled the spirit of the Vicomte de Valmont that evening. He never crossed the line where Josephine's parents would have had reason or better the chance to confront him, but I bet they are plenty worried now.
He beats around the bush in his letter a bit (a lot...), naturally, so for once here's what happened from my perspective:
Things started when the family of the dean greeted their guests. Marcello spent just a little too long with Josephine, including dropped handkerchiefs and touching fingertips. It went on to meaningful glances during the concert. He didn't speak to her after that, but whenever she turned around, he was there, watching her from across the room. This of course didn't escape her parents and her mother in particular was getting worried, she had obviously read the papers. That man was stalking her daughter, not to put too fine a point on it.
While everyone was concerned with the duel preparations, Marcello took his chance for another talk with Josephine and her mother didn't notice for a good ten minutes. When she did notice, she hurried towards the group, only to see Marcello leave with a impudent smile for her. She got another one of those smiles, even more brazen, when the guests left, telling her just how sure Marcello/Don Gabriel is of his conquest and how little she can do about it.
By the way, if you have never seen Dangerous Liaisons, you really should. The costumes are gorgeous, I don't know any other period movie that has done its research so well. Glenn Close and John Malkovich have fun being despicable and perfidious. It's simply brilliant.