Why would he hurt me so bad?

Why would this guy I like tell me how much he doesn't like me and can't stand me and wants nothing to do with me; than he turns around and is crazy in love with me and worshiping my every move. I feel so confused and worst of all still very hurt. Why would he do this? He to me so many bad mean things and now he loves me soo much. What is is about?
Why would he hurt me so bad?
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