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A girl is upset that she's all alone, unaware of the fact she's going to meet her boyfriend very soon
You're very much aware of the situation. The thoughts are realistic, description is powerfully packed in the small paragraph, and your narrator, even in the midst of this strong sadness, still recognizes the irony of the entire situation.
At the very start of the piece, you mention that the narrator will find "him" very close after this weekend. It would be nice to reference that at the very end of the piece. You could go on to describe him, his personality, why you two work well together, etc. It can be as long as you want, but it definitely feels like the ending line is missing.
I really like your story. It's short, but that doesn't have an effect on your writing. You gave description when you needed to and showing the narrator's thoughts always helped bring the scene alive. Good job! :)