How does Abbé Faria become even more of a father figure to Dantès?

The Abbe reveals to Dantes the existence of a hidden treasure on the Island of Monte Cristo. The existence was discovered by the Abbe by reading the will of Caesar Sprada, who had been made a Cardinal of Rome. Dantes at first thinks that the Abbe is crazy, but he changes his mind when he reads a letter, which reveals the exact location of the treasure. Abbe Faria tells Dantes that he meant to share the treasure with him once they escaped, but should the Abbe die, it shall all belong all to Dantes. The Abbe considers Dantes his son of captivity.