What's with the guys and teasing?

I have a guy friend I'm very close with. He teases me all the time when we're alone or talking on the phone. However never does it when we're out with other friends. More so, he tries not to talk to me at all but rather tends to lock eyes with me. If he talks to me or says something teasing he does it so no one hears it. I think he likes me as more than a friend but he does not want to admit it.
What's with the guys and teasing?
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