Hi disturbance,
Being in a position where you have to work with people you knew romantically or people you knew from childhood who were not kind to you is not easy.
I know this very well, I've worked in a health office with people from my past. It wasn't the easiest, coming in and constantly being reminded of the past. There were days when it got so rough that I wanted to quit on the spot but I ignored it.
I took all the wasted energy and focused on doing the work which kept me busy and mostly out of the office. My superiors saw my work and anyone who was visibily trying to shit on my work became visible to them. They eventually left or were reprimanded.
If your ex is harassing you; don't give him any opportunities to do so. Make good friends in the office. Stay away from troublemakers and try not to converse of be around them privately... in an office setting this can be difficult.
It never gets easy but you learn how to adapt and find good coping mechanisms. Especially if they are good ones, not drinking or resorting to gossip. Ick.
Still, when I got my managerial position it was tougher on me because there was that instinct to lash out for past grievances to my fellow workers. Thankfully I had friends who steered me away from that and other managers who had experience in dealing with those feelings.
If you have set goals and friends who will give you a shoulder to cry/vent on then you should be good.
Make a timeline for what you hope to achieve there, what you want to learn and how much time to do it in. If at some point you realize that you are not getting what you want from there, let your superiors know.
They may move you somewhere else... another office, another position, etc.
But you must put in the effort first, running away won't get you anywhere. There will always be a bully somewhere in your life, no matter what.
Anyway, good luck and peace!
