things are getting weird...:?

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I have a friend (though not a close one) because he has his own set of friends and I have mine. We were classmates before and then i frequently noticed that whenever I talked, he seems interested even though he's not included in the conversation. I don't mind it of course. WHat happened next was quite out of my control. He was my classmate again now that I'm in college. For the first two weeks, we do talk and laugh a lot. There was a short period of time i think 2 days where in we don't talk that much then after that, when he looks at me he has a glazed expression. He was called by our teacher and then I smiled at him coz he had that glazed expression while looking at me. It was only later that he realized he was called. then not only that while I was walking, he sort of put his hand on my shoulders and leaned on me while we were walking. i'm quite confused with his actions and please help me find a way to avoid him when he is my classmate