If a work colleague has ghosted me, how should I act around him next time I see him in work?

Confront him and ask what his problem is, maybe the both of you will be able to work on it. Or just go about your day and don’t even worry about it.
Remain as cordial because he's a co worker, but nothing beyond that.
Offer him a coffee then fake him out when he tries to take it.
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4Opinion
As normal.
You are at work, not a school or drama class.
Ignore him as well or ask him upfront why is he ghosting you?
the same way you'd act around anyone else at work
make him gohst you too
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