Anna realizes that clinging to Vronsky only pushes him away and makes up her mind to be calm about their separation. But the look he gave her before he left for the elections had shattered her composure.
Later than same night, Anna starts getting upset. She gets angry when she thinks about the fact that Vronsky can go anywhere he pleases and do anything he likes (including maybe leaving her), but that she is irrevocably bound to him.
Anna believes the only way that she can keep him is by remaining charming and beautiful.
She begins to think seriously of obtaining a divorce from Karenin so as to secure her tie to Vronsky.
For five days, Anna passes her time quietly.
On the sixth day, Vronsky does not return as promised, and Annie falls ill. As Anna nurses her daughter, it only serves to remind her more forcibly of the strength of her love for Seryozha.
That night, Anna freaks out and writes her letter to Vronsky, sending it off without reading it.
The next morning, Anna receives Vronsky's letter and feels regret at having written her letter, but at the same time she's pleased that he will be coming home soon.
Nevertheless, Anna is convinced that she is losing Vronsky, and that he is getting tired of her.
She decides that she wants him to be at home so she can know what he's doing at all times.
Annie has recovered by the time Vronsky arrives home. Anna doesn't care how he feels, she cares only that he is at home, where she can keep an eye on him. She looks beautiful as usual, and as Vronsky looks at her he feels tired of her beauty.
The couple spends a calm evening at home.
Later that night in their bedroom, Anna brings up the letter. She brings up her jealousy of his departures, and tells him that in the future they must stay together.
Vronsky protests that he's been willing to give up his whole life for her.
Anna says she will write to Karenin for a divorce.
Vronsky mutters an endearment, saying that he would love to be with Anna always, but his eyes tell a different story—the story of a man who doesn't want to get tied down.
Anna writes to her husband, and she and Vronsky move to Moscow and settle down as a married couple at the end of November.