Sam Mendes started dating Rebecca Hall while he was still married to Kate Winslet. He would never admit it of course and preferred the world to think that Kate left him for absolutely no reason. Of course, Kate kept her mouth shut about it too when she probably wanted to scream it to the world. Well, this week, Rebecca and Sam admitted they are dating and they have been dating since before the marriage ended too. No one will come right out and say that though. The Daily Mail has some source who says "they can't put an exact date" on it. Please. They had an affair. I can't believe someone cheated on Kate Winslet. Especially Sam Mendes. It is not like he is Ryan Gosling or something.