Why is this guy so mean to me only?

This guy in my class constantly is teasing me and saying mean things to me and about me. I sag hurtful things back but it doesn't make sense because he's only mean to me. he likes my friend texts her about me in class but she has a boyfriend. I don't understand I think he is just trying to get her attention but it's at my expense. I just don't understand what his problem is.
Why is this guy so mean to me only?
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