What do you do when the one who you rejected becomes the one avoiding you?

We had a history, where I was in love with her and she rejected me and she left me. Few years later she came back and I acted like I didn't know her. It messed with her already poor mental helath which in turn made the cold girl obsessed with me. She soon started connecting with my friends to know about me.

I cut ties with her but then I connected with her years later expressing interest. She was by then cold and distant. It frustrated me and I called her 'weird, creepo, not normal, mentally ill' all so for befriending my friends. I suggested her taking therapy to which she said 'Im happy the way I'm so leave me'.

Now she is in my firm, my department. She barely talks to me or looks at me. I tried talking to her she was polite and smiled but kept the distance like a colleague and cut communication short. She would spend hours with others or out lunch but wouldn't even look at me when I eat alone. She has a full office of friends and people really miss her on her off days. If she needs a quick drop, she would take help from someone or walk, but me. Thus when alone I tried to steer the conversation from colleagues to us as partners. She replied with the same cold tone but with the polite smile 'I (she) can come across as mentally ill and unstable. It may not add to your glow'.

What do you do when the one who you rejected becomes the one avoiding you?
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