issues with this guy

Hello my name is Rachel and I have asd and I’ve meet this guy with asd at my local mind centre he a nice guy but he really full on he got the impression that I want to be more than friends but I don’t fancy him at all. I tried talking to him about it but it’s not sinking in but I don’t know how to handle this situation I don’t want to upset him. He also keeps going on about meeting a woman to have sex with and that makes me really uncomfortable I’ve had relationships before with guys but I just feel really uncomfortable with this guy any advice to handle this situation please