A guy goes out if his way to tease me?

We work together and there a few that are our age and a few not. I notice that I'm the only one that he teases, excessively. Even when I'm serious. He's always trying to horse around with me and play games yet never ever with anyone else. He does it even when we're in meetings alone. I'm trying to not blush and giggle and pay attention while he tries to get me to laugh. I don't get it...why is he treating me so different?
A guy goes out if his way to tease me?
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