NBA players don't hold the same hatred of rivals as fans do - which is how some of them can leave the Cleveland Cavaliers and join the worst teams.
The Cavaliers may not have quite the same level of animosity toward another team as, say, the Boston Celtics have toward the Los Angeles Lakers, but there are certainly rivals about. Some are born from history and proximity, such as the Detroit Pistons, but many others are born from playoff battles, such as the Boston Celtics or Golden State Warriors.
When have players left the Cavaliers and broken the hearts of fans?