Male coworker mentioned that we were alone in the room, why?

We used to always have at least 1 day a week where it would be just me and him in the office, now they've hired some more people it rarely ever happens.

Except it happened a couple of weeks ago and he said "it's like old times this, it being just me and you, it's nice isn't it".

I felt abit awkward to be honest. Why would he say this?

Male coworker mentioned that we were alone in the room, why?
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