Molly had every right to be bitter- Fitz's relationship with her was the textbook example of his failure to connect to the people he cared about through suspicion and self-absortion. In nearly every case in the book he at some point ruins his connection to someone close to him through failure to trust- and Molly, and the promise of happiness that she brings, is at the core of this. She is the complete opposite- desperate to find someone to trust, hoping to find in Fitz an escape from her memories of her father- it is no small coincidence that her final decision to abandon him comes with the curse that he resembles her father in many ways. In the final assasin book, he completes this disconnection with the Lady-on-dragon- who also attempted to keep a part of herself to herself.
As for his closeness to the fool, in many ways this felt to me to be something largely contrived- I really didn't sense a connection between them until the third assasin novel, and even then it was a tenuous thing, certainly not the strong, instinctual bond that existed at the beginning of the fool series. Perhaps this is due to the fool's own sense of disconnection- another lonely traveller with a strong degree of secrecy in his nature. I suspect this is why the two of them ended parting- one cannot make a couple out of two individuals.
As for his closeness to the fool, in many ways this felt to me to be something largely contrived- I really didn't sense a connection between them until the third assasin novel, and even then it was a tenuous thing, certainly not the strong, instinctual bond that existed at the beginning of the fool series. Perhaps this is due to the fool's own sense of disconnection- another lonely traveller with a strong degree of secrecy in his nature. I suspect this is why the two of them ended parting- one cannot make a couple out of two individuals.