Dallas Mavericks star Cooper Flagg is going to be one of the NBA's elite talents for a long time. It remains to be seen whether he'll ever win a ring in Dallas. And given how quiet Flagg had been about his personal life throughout his rookie season, nobody knew whether he would ever get a ring off the court, either. That's still unknown. But he's a lot closer than many people had initially believed, given what has surfaced about the 19-year-old's love life in recent weeks. Dallas Maverick Cooper Flagg | Raymond Carlin III-Imagn Images Duke Blue Devils women's basketball Arianna Roberson was seen sitting next to Flagg's parents during Flagg's Rookie of the Year Award ceremony and press conference on April 29. This sparked rumors that there was a romance between the two, although some who have been following Flagg (who also went to Duke) suggested this had been going on for a while.…