I was hoping to avoid inflicting you with yet another long, personal story that could be summarised in a thread title, but...
OK. I like this INTP guy, a lot. I felt a chemistry with him from our very first real (one-on-one) conversation, during which we argued a bit and then he tried getting me to open up. I think we both sensed a kindred spirit, and he's said as much to me. We met doing some volunteer work, which I can definitely classify as enjoyable for both of us. Afterwards, I'd often approach him for a quiet drink and some intense conversation if we didn't happen to be going out as a group with the other volunteers.
The main problem for me is that he's impossible to read. His body language says one thing (that he really, really likes me) and his actions say something completely different (that he doesn't). For example, I've noticed him mirroring me perfectly during one of our group hang-outs, even though I was seated in quite an unusual and distinctive pose. And yes, I am positive that it was him mirroring me and not the other way around. However, he also seems to make work-related decisions that very specifically exclude me in a way that makes it difficult for us to have any contact at all. He bantered a lot with this one girl who I was surprised to later learn that he strongly dislikes and has met up for private drinks with another girl with whom he doesn't seem to have anything in common with and doesn't connect with at all (even though she's crushing on him). He ignores me if I don't approach him but then is warm and receptive when I do, even when it means he has to drop what he's doing to talk to me. He doesn't ignore other girls.
It's driving me up the wall and I'm finding it hard to get closer to him with all this confusing behaviour. INTP guys, stop this. If you like a girl and are straddling a bench together, looking intently into each other's eyes during a long-drawn silence following quality conversation, just grab her and kiss her! It's what I wish he'd have done, instead of turning away and choosing a new subject.