Why do they keep working him into conversation?

The male co workers have been working one specific other male co worker into conversation telling me about his other job most of the time then one about said co workers taste in music. The co worker is typically friendly but I think he shows signs he likes me, which I may be reading too much into it.
Why do you think they keep bringing him up in general conversation with me?
Why do they keep working him into conversation?
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