Sometimes the grass isn't always greener.
I got told false promises of promotion for over a year, whilat doing a job well above my pay rate for near 1.5 years. Ended up looking else where and got a role. When i handed my notice in I got offered the promotion to stay, but being the stubborn person I am I decided not to take it, and since I was doing a salary based role on a shop floor level pay, i gave them the minimum time i had to (1 week) and left. I did pre-warn them I was looking elsewhere and they needed to train someone else up as either here or external my goal was not to stay in the role i was in long term, due to studying a self funded part time degree. This did I know cause problems as the role i was doing was rather unique and takes a lot to learn, and having only gave them a weeks notice for a job that only I could do I was told caused a lot of problems which ultimately i did feel a little guilty about despite the fact they deserved it.
Long story short i was too set on proving a point i walked into a job that i was open and honest from the interview stage, not realising the company interviewing me was not as honest and sold themselves more than they should.
Now I'm in a role I'd consider less on paper than what I was previously, and certainly less than the promotion i was offered on leaving.
I'm too engrossed in my studies to change roles again and have to learn new things, and I'm also struggling to put good achievements in my new role on my CV to try and sell myself better