My director is fucken petty!!

This woman asked me not to go back to the university because she wants me to be able to concentrate at work. She said she will make me a manager if I don’t go back. I’m not sure what manager wouldn’t want her staff progressing!!!! Either ways I went back to uni. Guess what my manager did to spite me? She asked one new staff who have barely been with us for a year to be the manager. She clearly did that to get me upset. Now I have this new staff bossing me around 🙄 could care less.