| Quote #7
"No; she only told me she wished to send me to London to serve the interests of an illustrious personage."
The expectation is that husband and wife be loyal to each other. By breaking this bond, Monsieur Bonacieux becomes a traitor in the eyes of Madame Bonacieux. And further smoothes the way for D’Artagnan to step in and seduce the woman…
| Quote #8
At the same instant, four men, armed to the teeth, entered by side doors, and rushed upon Athos.
Athos’s loyalty to his friend is demonstrated when he risks his life so that D’Artagnan has a chance to get away,
| Quote #9
"Now," said the baron, "look at this woman. She is young; she is beautiful; she possesses all earthly seductions. Well, she is a monster, who, at twenty-five years of age, has been guilty of as many crimes as you could read of in a year in the archives of our tribunals. Her voice prejudices her hearers in her favor; her beauty serves as a bait to her victims; her body even pays what she promises--I must do her that justice. She will try to seduce you, perhaps she will try to kill you. I have extricated you from misery, Felton; I have caused you to be named lieutenant; I once saved your life, you know on what occasion. I am for you not only a protector, but a friend; not only a benefactor, but a father. This woman has come back again into England for the purpose of conspiring against my life. I hold this serpent in my hands. Well, I call you, and say to you: Friend Felton, John, my child, guard me, and more particularly guard yourself, against this woman. Swear, by your hopes of salvation, to keep her safely for the chastisement she has merited. John Felton, I trust your word! John Felton, I put faith in your loyalty!" (50.62)
John Felton has every reason to be loyal to the Lord de Winter and not to Milady. It is terrifying when Milady overcomes all of those reasons and manages to turn Felton into her devoted servant.