“The actual love story, as far as I’m concerned and as far as Ruth is concerned, her greatest love is Kathy. And I think actually the whole reason why she goes off with Tommy in the first place is because she’s so in love with Kathy as her best friend, and cannot handle the idea that Kathy would be in love with anyone else. And so, she separates the two people. But I think it’s literally the jealousy of seeing the person you love in love with someone else. And actually, in this case, I think it is in fact Kathy. It’s not so much Tommy. I think it’s these two best friends, and she can’t handle the idea that Kathy doesn’t want to be with her. But yeah, they’re best friends. They always have been. They have a very strange relationship. It’s two people who have grown up with each other since the word “go.” They’re like siblings who bicker, who piss each other off, but nevertheless, there is this huge love there. I think they are, as much as these characters can ever have, family, they are family.” - Keira Knightley