Sandra Bullock fell into a "depression" after co-star George Clooney finished filming his scenes in their hit film Gravity. The Oscar-winning actress, who portrays Dr. Ryan Stone in the outer space drama, really did feel as lonely as her character for much of the movie - after here pal completed his scenes. She tells Variety, "When George came, it was like this energy for us and you were so appreciative of him being there. And then when he left, I had never been hit with a depression like that. We had so much fun for three weeks, but then my friend left. "I was amazed at how I was affected by him going. I had a hard time saying goodbye. I didn't wanna look at him, I was just gonna give him a pat and I walked away - and I was mad."