Why does my guy friend hate me now?

blahblahgirl4
My guy friend hates me now! We've known each other for about 5 years now. I talk to him occasionally because we don't have many classes together. One day jokingly I said, "Wow you're so fake! We never talk anymore." He gave me the dirtiest look and said whatever then walked away from me mid-sentence. This happened a month ago and we still haven't talked. Now this is very alarming because he's known for being the sweetest guy. He still hasn't apologized or attempted to talk to me but he has no problem talking to my friends especially when I'm already in conversation with them. Can someone explain this to me?
Why does my guy friend hate me now?
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