Why does he walk out of the room everytime I walk in?

It's something I've been observing lately and I'm not sure if I should count it as just a coincidence. I stay late on campus every Mondays and apparently, he does the same thing too and stays where I usually go every Monday evening (but not on any other day of the week). I find it odd that he only goes there every Monday evening as well, but everytime I walk in the room, a few minutes later, he packs up and leaves.

Recently, a few seconds after he saw me and my classmates walk in, he immediately ducked down to get his bag to prepare to leave.
Why does he walk out of the room everytime I walk in?
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