What should i do? (long)?

I really don't like this guy even b4 everything happened. Anyways the guy is so gay,but I stil talk 2 him and everything i don't hurt poeple jut cos they're annoying or wierd. But a few weeks ago he became way obsessed with me like trying to hold my hand and kiss me EVEN tho i had a boyfriend. Of course i rejected himi just sed look i don't think about u in that waybut he continued andhe evencame sat wiv me and my boyfriend got really pissed cos he knows wat was going on and he didnt want him 2 sit wiv us. Anyways a few weeks lata i tol himidon't want anything to dowith himanymore cos he was freakin me out. So then i started hearing stuff frompeople that he was spreading romours that i was somekind of slut that went hittingon all these guys eventhoialready had a boyfriend. Allmy friends believe i didnt do it. Now he's saying all this stuff like he would never do that and he wouldnt want 2 lose me a s a friend and i told him he already had b4. He's denying evrything, what should ido?