I really didn't like the ending to that. I agree with kinglis, the whole set up seems to be much more appropriate for a comedy than a tragedy, despite the apparently "sad" nature of Shae's perspective. The ending loses much of it's effect due to the brief nature of the entire piece. I'm also understanding why you'd probably choose the same staircase for each scene with the same action, but again that doesn't help set up the tragedy - tragic events in film should be lead up to, or even hinted at, whereas what you've got it a girl on a staircase who likes some douche who knocks her over and then kills herself because he doesn't notice her, which in my opinion just isn't a very good reason for killing yourself and doesn't make much sense. Having different scenes that show her one-way interaction with Eric would help lead up to it all, even perhaps making things cyclical or better showing her affection for him. For example, after going from the first stair scene you don't have to go to the next day's exact same scene, you could show her at work or wherever it was that she was going thinking about him (perhaps even finding him on a social networking site and trying to add him as a friend, or even hinting at a past with him by having something like a school photograph with him in it far away from her - something to break up the repetition).
As is, the pacing is "I'm sad, I'm sad, I'm sadder, I'm dead", and really it shouldn't be so much of a jump to find her being dead. Also, hanging herself on a public staircase seemed very out of character.
If you're still intent on doing something like that, I suggest changing the ending from
to
You could even make it readily apparent that the hand is hers by linking an object from before, perhaps having a previous scene knock off one of her rings and that same ring be on her hand in the final shot. Because really, having such a change of character at the end doesn't seem right. The shy girl suddenly goes attention deficit with the way she kills herself and the guy who showed her literally no attention suddenly is shocked? I'm not buying it. I think the guy should just repeat the same actions that he's done for the rest of the scenes and the girl should have killed herself in her own apartment.