In Sherman Alexie's The Absolutely True Diary of a Part-time Indian, Junior--the narrator and protagonist of the novel--lets the reader know in early chapters that his best friend on the reservation is Rowdy.  Although Rowdy is a pretty mean and physically strong guy (largely due to his unstable home life), he looks out for Junior at school and on the reservation.  Junior is privy to Rowdy's inner life; for example, Rowdy lets Junior into his world of comics, and through activities like this, Junior learns that Rowdy does have a soft spot inside the hard exterior.  However, when Junior tells Rowdy that he will leave Wellpinit to attend school at Reardan, Rowdy feels like Junior has become a "white-lover," and Rowdy lashes out at the sense of betrayal he feels.  Junior tries to explain his decision and to maintain the friendship, but Rowdy does not want to be his friend.  For the majority of the novel, we as readers see the tension between the two boys, but at the very end of the novel, Rowdy and Junior play basketball together.  This final scene implies that outside the scope of the novel (in other words, if the novel were to continue past its final page) the two boys do indeed pick up their friendship again.  So yes, Rowdy and Junior become friends again and seemingly are working to repair the damage that has been done to their initially strong friendship.