How did Abbes help Dantes conclude who are responsible for his incarceration? - provide quotes if possible

The Abbe walked Dantes through the events proceeding his arrest, sparking Dantes memory of even the smallest of details.

“So that when you went on board the Pharaon, everybody could see that you held a letter in your hand?”

_____________________________________________________________

“Now, listen to me, and try to recall every circumstance attending your arrest. Do you recollect the words in which the information against you was formulated?”

“Oh yes, I read it over three times, and the words sank deeply into my memory.”

“Repeat it to me.”

Dantès paused a moment, then said, “This is it, word for word: ‘The king’s attorney is informed by a friend to the throne and religion, that one Edmond Dantès, mate on board the Pharaon, this day arrived from Smyrna, after having touched at Naples and Porto-Ferrajo, has been intrusted by Murat with a packet for the usurper; again, by the usurper, with a letter for the Bonapartist Club in Paris. This proof of his guilt may be procured by his immediate arrest, as the letter will be found either about his person, at his father’s residence, or in his cabin on board the Pharaon.’”

____________________________________________________________

“And how was the anonymous letter written?”

“Backhanded.”

Again the abbé smiled. “Disguised.”

___________________________________________________________

“Was there any person whose interest it was to prevent your marriage with Mercédès?”

“Yes; a young man who loved her.”

“And his name was——”

“Fernand.”

“That is a Spanish name, I think?”

“He was a Catalan.”

“You imagine him capable of writing the letter?”

“Oh, no; he would more likely have got rid of me by sticking a knife into me.”

“That is in strict accordance with the Spanish character; an assassination they will unhesitatingly commit, but an act of cowardice, never.”

“Besides,” said Dantès, “the various circumstances mentioned in the letter were wholly unknown to him.”

“You had never spoken of them yourself to anyone?”

“To no one.”

“Not even to your mistress?”

“No, not even to my betrothed.”

“Then it is Danglars.”