My coworker won't socialize with me!?

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I've been working at this one job for 2 1/2 months. And I've noticed this one male coworker doesn't really talk to me.even when I was new.I could be working on a project with someone else and he'll come over and talk to that person only.and if he did talk to me it was about work stuff which was hardly ever also. It wasn't until a recent work staff development trip did we start talking more.but it's only about work projects and even then it's still little. But then right now he started socializing with this new employee who's only been here less than 2 weeks and it's like what gives?!
My coworker won't socialize with me!?
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