What should i do, i really like him?

this guy always stared/smiled at me. bt ever sinc every1s been tellin me he wants to go out with me hes been actin strange& sometimes wont even look at me. he used to finger me when he asked to. bt now, ever sinc he spread a rumor that he did ual things to me, nd i denied them hes been acting mad, nd said he wont drive me home anymore cos he has a gf. what should i do, i really like this guy?