Harry's Friendship with Ron and Hermione
Harry Potter and the Prisoner of AzkabanThe strength of the trio's bond, including their arguments and reconciliations over Scabbers and the Firebolt.
increasing
Bearing strength in each event
decreasing
The Firebolt argument

The Mistrust
The Gift
Harry receives a Firebolt for Christmas. He is ecstatic, but Hermione is suspicious. She reports it to McGonagall, who confiscates it for jinx checks.
The Fallout
Harry and Ron are furious with Hermione. They stop talking to her. She feels ostracized and spends time alone. The friendship is strained.
The Reconciliation
After the Firebolt is cleared, Harry and Ron realize Hermione was only trying to protect Harry. They make up, but the tension remains until Scabbers' disappearance.
Scabbers' disappearance

The Blame
The Accusation
Ron finds blood on his sheets and cat hairs, concluding that Crookshanks ate Scabbers. He blames Hermione. She denies it, and they stop speaking.
The Cold War
Hermione is upset and lonely. She visits Hagrid often. Harry is caught in the middle. The tension lasts for weeks, affecting their group dynamic.
The Resolution
When it is revealed that Scabbers is actually Peter Pettigrew, Ron realizes that Crookshanks was trying to catch the traitor, not eat a pet. He apologizes to Hermione, and they reconcile. Their friendship is stronger.
Christmas holidays
After the Ravenclaw match