My ex girlfriend (dumper) stares at me from afar which sends me mix signals but avoids eye contact, what does it actually mean?

Updates
7 mo
The face expression I get from her is not intimidating at all more like observing/regret
Updates
7 mo
She broke up with me 5 months ago (she wanted to focus on herself) since than I strictly applied no contact. I do want to mention we work in the same workplace environment so we come across each other every once in a while. She had not seen me for 5 months since I was out due to injury and I just return back to work a week ago but since than she will stare while I’m not looking from a distance and I noticed from the corner of my eye but avoids eye contact when in front of me. It confuses me.
My ex girlfriend (dumper) stares at me from afar which sends me mix signals but avoids eye contact, what does it actually mean?
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