Why would a guy coworker want to spend more time with a girl after rejecting her?

Why would he offer to help you more and sit one to one after he rejected you?

When I say rejected I mean he said he has a girlfriend (I didn’t know that before) and now he’s offering to work together more, when really we don’t need too. He tries to get my attention when talking to other guy coworker.

What gives?

Shouldn’t he technically be avoiding me or at least be interacting at the bare minimum in a professional sense?

Why would a guy coworker want to spend more time with a girl after rejecting her?
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