Search Results: break up with my online boyfriend

So I have a crush that I have liked for over a year now. Unfortunately, he has a girlfriend. While I would never try to break them up (never even consider it), I am curious because as I get to know him more and more (we've become really good friends) it seems like he likes me as more than a friend. I know that he's happy with his girlfriend but I can't help but wonder... Firstly, I have a LOT of guy friends (they're awesome) but none of them act the way he does. For instance, he knows I write for an online site and spent hours trying to track down my account. Similarly, he talks/texts/fb messages me all the time and always responds to my messages. He's always cracking jokes at my expense (not in a mean way) and laughs at my awful ones. We share a lot of common interests and share 5/7 classes. He often sits next to me. Also, my younger sister's boyfriend swims with him and I asked him if he knew anything about the guy. He responded and continues to update me (with pictures which I don't need and weird updats like "he was late to practice today"). He almost always sits next to me (like today he convinced his two friends to move over to the table I was sitting at with my friends and sat next to me). When we're talking he looks directly into my eyes and positions his body so that it is facing mine. He was recently offended that I partnered with one of my other friends instead of him for a project. Any quiz I take seems to indicate that he does like me.
YET, he has a girlfriend he seems happy with. Any idea of what's going on in his head? I'm not going to press the matter because I don't want to break them apart, but for my own curiosity I would like to know. Do you think he likes me? Is it likely? And if he does is there any chance that he will break up with her to be with me?
Thanks in advance!