Does he miss me?

Sooo me and this guy got into a very bad argument three days ago, we haven’t talked for days. We don’t have each other’s number yet so I can’t text him. We see each other everyday at work. I catch him staring at me and looking down when I look at him but then played it off like he was looking for someone else. He walks past me slowly but looking down. I miss him and really want us to be on good terms again but I don’t know how to approach him without being awkward.
Does he miss me?
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