Why does he flirt with me in private but yet in private...?

So this guy that I work with has flirted with me in private. Private as in, no one was in hearing distance. But he has flirted with me on several occasions. But whenever the rest of our coworkers that we are mutually friends with, are around, he barely talks and looks at me. What's up with that? I feel like... show more So this guy that I work with has flirted with me in private. Private as in, no one was in hearing distance. But he has flirted with me on several occasions.
But whenever the rest of our coworkers that we are mutually friends with, are around, he barely talks and looks at me. What's up with that?

I feel like the least he could do is make conversation with me when other people are around but he barely does. And I find it odd? Why is he like this?
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