How we cite our quotes: (Part.Chapter.Paragraph)
Quote #1
Elisa, Madame de Rênal's chambermaid, had had no trouble falling in love with the young tutor; she spoke of him, often, to her mistress. (1.7.4)
Julien Sorel is a bit of a local heartthrob. Unfortunately, his lack of interest in the servant Elisa is what eventually makes this girl tell half the town that he's having an affair with Madame de Rênal. Whenever love is in the air, jealousy is usually close by.
Quote #2
At sixteen, Madame de Rênal, rich heiress of a devoted aunt, was married to a well-bred gentleman, having neither experienced nor witnessed, at any time in her life, anything that resembled in the slightest the word of love. (1.7.59)
Madame de Rênal has always done what society expects of her without ever wondering too much about what she wants. It's not until she's married with kids that she starts to wonder what love really is. The arrival of Julien Sorel into her life is definitely going to keep her curious, too.
Quote #3
Made more skillful by love, she explained her reddened face by a frightful headache. (1.8.24)
In other words, having an affair has made Madame de Rênal a much better liar than she used to be. She has been sneaking around behind her husband's back, so it's much easier now for her to lie to his face whenever she needs to disguise her feelings.