Feeling Betrayed
Once, there lived a young unicorn filly in a small town. Before, she was a happy little pony. But not anymore. Because she had a good friend at one time. Together they had fun practicing magic and playing games, until the day her best friend got his cutie mark immediately after preventing a near accident.
He was so excited that he left her all alone at his own house. The young unicorn watched her friend being surrounded by cheering ponies from the front door of her old friends house with disbelief. "Why?" the unicorn filly thought, watching her friend being cheered on by everypony, including his parents.
"Why did that have to happen?" the filly asked, "Everpony is cheering for him now. What about me? Am I a shadow?" The young filly looked at her black flank and sighed. "Am I not good enough?" she thought to herself, "Me, Starlight Glimmer. Just a no pony?"
She remained there, sad and alone for a while. Some time later, the young unicorn filly, named Starlight Glimmer chose to leave her old friend's home and go back to her own home. "I don't know," Starlight Glimmer thought, "Well, I thought I knew, but not now."
She eventually returned to her home, sad and depressed. "My best friend," she said, depressed, "Sunburst. He got his cutie mark first. He got it from performing a spell that stopped a tower of books from falling onto me. Then, like that, I was forgotten. Immediately!"
She didn't even bother to open the door with her magic. So it took her some time to get inside.
That afternoon, Starlight Glimmer walked up to her room and sat on her for the remainder of the day. She'd never gone down to have dinner at all, even if she was hungry. All she could think about is her friend, Sunburst, or should she even call him friend anymore?
And of course, cutie marks. "Why did that stupid thing appeared like that?" Starlight Glimmer thought.
Starlight Glimmer was too depressed to think about it more that night, so she went to bed early that night. Way early to be precise, still thinking about what happened that day.
At the time, she didn't know that what happened that day would lead to big problems in the future.