Why does he keep copying me?

There is a manager at work who is acting very strange with me. He is higher than me in rank, but yet he seems to be competitive with me. Since meeting me, I've noticed that he has taken on my mannerisms and personality. He talks like me now, uses words that I use and delivers them in the way that I do. He even writes like I do now. It's like looking at a male version of myself.

However, he will barely even make eye contact with me and he refuses to say "thank you" to me when I've done good work for him. It's like he's acting like I don't exist... yet he's copying me at every turn.

What is his problem?
Why does he keep copying me?
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