Wow. I guess I would have to say that I am a little bit confused about what is going on. Are you interested in anyone else specifically? Do you ever bring up other boys around this friend?

Maybe you and your friend need to sit down, even in a joking way, and ask each other exactly what is going on. It seems like you may both be coming from totally different places, but it is possible that you may have the same point of view. Right now his constant joking and teasing with you might be his way of showing affection, but if it's making you upset, it's only going to make your relationship more stressful for you, and he needs to know that.

Sometimes you really need to figure out if someone is just better as a friend with lots of tension and decide to just leave it at that, enjoying both the friendship and the occasional confused flirtations.