Hello. Typical shy, nerdy dude here. I haven't exactly read anything except your most recent post - which to me kind of sounds like an attraction. Or, that's the kind of somewhat creepy attention I would be giving (apologies to clueless girls in my past). Just so happens that I'm also bi, so I can attest to the difference between "leading on" (though I have never consciously done this, I try to keep boundaries well defined (which is near impossible to do, but seems to work most of the time)) and "coming on" (also impossible to do, what I'd do if I liked a girl would probably end up being interpreted as extremely awkward behavior).

All in all, it seems he likes you and is horrible at hiding it.
Will be awaiting further developments...