Your promo is brilliant. Short, to the point, and it got me interested.

As i'm reading the first several paragraphs, i'm really enjoying your writing. I love the mention of a beautiful evening gown.

I literally said "Damn!" when I read that her best friend is getting married to someone else. The setup is brilliant. I'm nodding my head with the conclusion already drawn that she's getting married, and boom! A plot twist.

And in the fourth paragraph, nonetheless!

I really like this part: "I'd be undulating with giddiness, from the top of my head down to the tips of my every single toe. Just like how I'd felt whenever I'd watch all those sappy, romantic movies." Very well-written!

The only thing I recommend is fixing your grammatical errors. Give it another read-over and fix things like proper spacing between dialogue. A great tip is reading your story out-loud once you're finished for fluency and errors. Try it next time.