Ideas, who has them?

MoleskineI've been stuck on a project for months and it's super frustrating. The critique I've gotten for it is almost exactly the same kind I used to get from my mentor back in college -- the story structure is incomplete! I always have a beginning and a middle, but never a freaking end. I've been trying to work on a good ending for my short film, but I just can't seem to get to it. Maybe I'm just into open-ended stories? I'm blogging right now because I promised myself I'd post at least once a day to get my brain working again. I've also been watching movies every night. What more could I do, really? Talk to people on the street? So far, I still haven't thought of how to end my story. How do I end my story?!