Best Friend Or BoyFriend?

my best friend and I have what you can call..an interesting relationship.
My problem is that he tends to send me mixed signals. One moment he's telling me, "oh we'll never date!" (In which I agree upon) and the next he's asking me on dates, kissing me, and holding my hand. 
I'm so confused, I don't know wether I should ask him a simple "what are we?" Or just leave us where we are?
Can anyone PLEASE give me any type of advice??