Friendship Restored
Harry Potter and the Half-Blood PrinceAfter Ron's poisoning and break-up, he and Hermione slowly reconcile, with Hermione admitting her feelings.
increasing
Bearing strength in each event
decreasing
The Rift Deepens

The Separation
The Cold War
Ron Weasley and Hermione Granger are not speaking after their fight. Ron is dating Lavender Brown, and Hermione is hurt. Harry is caught in the middle.
The Tension
Hermione becomes withdrawn and angry. She avoids Ron and spends time with Harry. The Gryffindor common room is tense.
The Breaking Point
Ron's poisoning is a turning point. Hermione is terrified of losing him, and her anger fades. She rushes to his bedside.
The Reconciliation

The Healing
The Apology
Ron breaks up with Lavender and begins to talk to Hermione again. He apologizes for his behavior. Hermione forgives him.
The New Understanding
They start spending time together as friends. Hermione helps Ron with his homework. The old ease returns.
The Hint of Romance
Hermione's feelings for Ron are evident, but they do not act on them. They are content to be friends for now, but the bond is stronger than ever.
The Promise to Harry

The Unbreakable Bond
The Decision
When Harry decides to leave Hogwarts, Ron and Hermione immediately declare they will go with him. They are united in their commitment.
The Support
Ron and Hermione's friendship is now rock-solid. They are ready to face any danger together. Their love for each other is implicit.
The Future
They will embark on the Horcrux hunt with Harry. Their relationship will continue to grow, but for now, they are focused on the mission.
late February, before Ron's birthday
early March, after Ron recovers
late June, after Dumbledore's funeral