The new employee I trained just got the promotion I was applying for. I don't know what to do.

I've been at this company for about two years. For a long time, I was the one carrying our department when my manager was swamped with work and we were short-staffed. Then, about four months ago, a new girl started. And guess who had to train her on everything? Me.

Despite all that training, she constantly messes things up. I'm talking about trivial mistakes, almost every day. Look, I'm not perfect either, nobody is. But the number of mistakes she makes is just not normal.

Anyway, the assistant manager position opened up, and of course, I applied for it; it's what I've been working towards. But suddenly, the new girl applied too. We went into a six-week 'evaluation period' that was a complete joke. In the end, they gave her the position. And the excuse my manager gave me? 'She just has more prior experience than you'.

I'm so done with this company. It's disgusting.