<human>: Initially after the breakup, she seemed to be okay. It has now become apparent to me that she was in denial or hoped that I would get back together with her because she is now clearly angry with me.

She thought I broke up with her because I was interested in someone else, possibly a coworker, when I am not. The reality is that I am not really interested in a long term relationship at this point in my life and I don't want children probaby ever. I expressed this to her and felt that it was in both of out best interests to no longer date because my beliefs were contrary to hers. I promised to her that I would not "hook-up" with or date any coworkers as long as we both worked there.

In the last few weeks, she has begun to simply ignore me and now believes that I'm "hooking up" with a female host. When I got the first text message expressing her anger that I was doing this (which I am not), I simply ignored it because there was no foundation to the accusation and I didn't want to get into an arguement via text. Last night she said that I should look for a new job and again expressed her disgust at my alleged actions. I simply replied that I wasn't in a relationship with any coworkers. I have no intention of finding a new job because I'm one of the best employees in my position and I enjoy the work.

My question: How should I proceed? Do I need to address this is management and/or HR?  The managers are okay, but I would rather contact HR.

Summarize the given text in a few sentences.
<bot>: Ex and I work together. She says I'm hooking up with a coworker when I am not and promised her I wouldn't. Now she wants me to find a new job. Do I contact HR/management?