My ex won't look me at me?

My ex broke up with me. Whenever I went into the office that he works in (I have to for professional purposes) he won't even acknowledge my existence. We started talking again and he dropped me again. Now he still won't look at me. He won't looks at me when I walk passed his office. He's ALWAYS staring but if he would have to look at me face to face he will ignore me. What could this mean?
My ex won't look me at me?
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