everyone forgets Ron tried to come straight back to Harry and Hermione when he left.
when Harry is mad about something, he goes into passive-aggressive mode and refuses to let the person he’s mad at forget it
when Hermione is mad about something, she freezes out the person she’s mad at and refuses to engage until she feels ready to deal with it
when Ron is mad about something, he tends to make dramatic gestures that he has difficulty taking back, even if he wants to, which he usually does