The subject line of this thread reminds me of one of my favourite Walt Whitman quotes:

"Only themselves understand themselves, and the like of themselves,
As Souls only understand Souls."

It sounds to me like you're falling for this guy... and that's a good thing! I'm like you in that I don't click with a lot of guys. I'm very rarely attracted to men. I don't get crushes as often as my friends do. I have to feel a very strong connection with a guy before I feel like a relationship is worth the effort... because, rationally, I feel like I need to be in love about as much as I need another hole in my head.

When I DO feel that connection, though, I have learned that there's no point in trying to make sense of it or fight it. Love isn't a rational thing. It's a form of temporary insanity... but in a good way. So, if you have strong feelings for this guy, embrace those feelings. You may not understand the guy completely or understand exactly why you feel the way you do, but falling in love can offer us new insights into who we are and what we want... and that's a very positive thing.