Article continues below advertisementDavid Harbour gave rare commentary about his relationship with Millie Bobby Brown amid allegations of harassment and bullying.In a behind-the-scenes interview from Stranger Things Season 5, the actor, 50, admitted he has "been through a lot" with his costar.Harbour broke down his relationship with the 21-year-old on and off the screen.Article continues below advertisementSource: MEGADavid Harbour and Millie Bobby Brown star in 'Stranger Things.'"We're very close, Millie and I. We've been through a lot together," he disclosed.