What revelation does Junior have about his victory, and why does it make him weep? in The Absolutely True Diary of a Part-Time Indian answer this in 3 sentences

Answer 1

Junior realizes that his victory was tainted as it came at the expense of his best friend Rowdy. He understands that his decision to leave the reservation and attend a predominantly white school caused Rowdy to feel abandoned and betrayed. This revelation makes Junior weep because he deeply values his friendship with Rowdy and realizes the toll that his personal pursuits have taken on their relationship.