so weird....HELP!!!!???

this guy i know for a couple of years.we know each other, but only chat online,he is not very sociable. we struggled to have a conversation first, then got to know each other and we can actually have a conversation now. he is a mystery for me and i find myself attracted to misteries.recently i told him about few of my sexual preferences and experiences and he seemed impressed.since that time,his attitude changed.maybe im imagining things,but he is more caring now.he still picks on me ALL THE TIME.whatever i do,he manages to turn it around and make it seem weird.we always have these playful/arguing conversations.i could say he is having fun talking to me.why he is picking on me and makes me look like a crazy person?he always changes around the stories, but i do feel that smth has changed in his attitude towards me..what do u think happend?