What does this mean? its confusing me ?

i asked a question like this yesterday and i just wanted a lot of people opinions because i might just be thinking this or just might be the way he is? im 17 male well there is this boy i know he is like 2 or 3 years older than em and basically i think he is gay/bi because if he was straight he would keep bringing up gay topics and everything he is friends with my sisters bf so he is around often and from day one he has called me gay and asked me have i any men on the go? so i always reply nope none et and joke around im in the closet btw? and im bi? anyway its like he is interested in me i was at a party he was at lastnight and we kept catching eachothers eyes? and you could feel the vibes definately and in the bathroom i asked him why he thinks im gay i dodt go mad i was joken around too? and he replied because im gay and i said yeah i know you are and he said no i really am? and tonight out he kept saying we will go on a man hunt together and we wer playing have you ever and he says dont say you've not kissed a boy because you have and laughed he seems flirty? so is he gay or just taking the piss? i will admit im kinda starting to like him he is unbelievably hot! help please its confusing me! Thanks..