| Quote #1
After the departure of Athos for Blois, Porthos and D'Artagnan were seldom together. One was occupied with harassing duties for the King; the other had been making many purchases of furniture, which he intended to forward to his estate. (2.1)
This is an ominous hint of the direction their friendship is taking. Porthos, Athos, D'Artagnan, and Aramis used to known as "the Inseparables" in The Three Musketeers. This is not the case in The Man in the Iron Mask.
| Quote #2
"Have you a brother?" said the young man to Aramis.
It seems that Aramis does not love his friends.
| Quote #3
"And this man, who would shed every drop of blood in his veins for me, will not open the smallest corner of his heart. Friendship, I repeat, is nothing but a shadow and a delusion, like everything else that shines in this world." (14.76)
D'Artagnan is dramatic in an effort to goad Aramis into confessing his plans.