Recently I was having a relationship with someone from my workplace who is senior and whom I report to.

Having ended this, I am now being belittled and criticised constantly and it is making me quite anxious within my role.

Although I know my performance is exemplary, I continue to be hassled and I believe my manager now wants me out of the workplace asap without anyone finding out what happened, so is making things uncomfortable for me, albeit in a very ambigious and secretive way.

Can anyone offer any advice as I am concerned this may ruin my career?

My professional advice would be to make records of the details of when/how you feel singled out for unfair criticism incase of future reference. It's always difficult to recall the minor examples if put on the spot, but collectively you may have a stronger case if you are able to list several examples. Be cautious not to cloud the issue with paranoia or personal feelings that are not within the realms of your professional position, work, or duties. If the working relationship does reach an untenable state, then you may have to follow your company grievance procedure. Before it reaches this stage, I would advise speaking with either a trusted manager, or another senior person in the business, but choose carefully who you share this information with or it could quickly become gossip. I am speaking candidly when I say unfair as it may be, unfortunately it happens more often than perhaps we realise, and quite often the innocent (junior) person loses.

My personal advice would be, if possible, to either talk to or write to your manager and express your feelings to them firmly but fairly. Depending upon your relationship, and only you will know this, you may be able to appeal to them or at least indicate that unless it is resolved then you have to consider raising it for a formal discussion. I hope the potential for this would be sufficient for them to take greater care in your professional dealings in future, but again adversely you must ensure that you are not favourably treated as a result or a situation of positive discrimination may unfold which is equally as undesirable.

From personal experience, and as a Head of HR, I do empathise with your situation and hope that you can reach an agreeable outcome. However, feel you must take positive control of the situation whilst also considering that personal feelings may run so deep that ultimately the situation is irreparable.

This is a situation that has no single solution I'm sorry to advise, but as in many cases compromise/fairness and an openly honest approach may yield results.

Keep us updated. Good luck.