Why does he do this?

The ex and I work in the same building, different areas on opposite sides, there is no need for us to ever really bypass each other. In my opinion it seems he makes it a point to come by my area and look in on occasion, I don't understand why he does this seeing as he's the one who initiated the breakup. It's making it hard for me to get over him and to not think about him.
Why does he do this?
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