I'm a bit like this guy 'cept i dont creep on people like that. The thing is i never had any female friends in preschool, elementary school and so on. And i find it hard to interact with anyone, without having some basis of conversation connected to games, book, anime or certain films. And as I live in a country where most people think video games are childish, haven't heard of anime and if they have they consider it childish and don't read books or watch a bit more intelligent films, I'm not that social. Not that im excusing myself for that. He MAY be like that, I dont know since i dont know him.
He may just really, really like you like how i like a girl but haven't told her coz there's no point because I know she doesn't and won't reciprocate my feelings. I did feel a sting (silly, right?) when I learned she had her first time with a close friend, but right now when I think about it i dont feel anything. Maybe it was just a crush that i've grown out of, I dont know.
And last but not least, some girls like to have guys they know like them around, to boost their confidence and ego a little. I'm not saying RinLittle did it, but to guys that have been in my situation any kind remark on anything of the sort can make them think you like them or that you could be together. Not that girls don't do it too, but it's rarer. It's sad I have this kind of knowledge, but I hope i've been a bit useful. As for the "i'm horny part" that's creepy. And besides im 17 and I hope I can get out of this introvertedness, but they guy is 30, I dont think he has any prospects at that. Just cut off contact with him entirely, like many people have said before me.