The guy I like just broke up w/ his girlfriend. What should I do?

I met a guy last year in one of my classes. We became friends and started hanging out a whole lot. I even started to get a little crush on him - but, the catch is, I had a boyfriend then (we've since broken up), so I didn't act on it. Then, I went abroad for a semester and, while I was gone, the guy friend started going out with a girl (who happens to be another one of my friends. ) They actually went out until just this week; she broke up with him.

Even though they've been going out for the last year just about, I still had a crush on him. He would do things that I considered to be flirting or showing interest, such as poking me a lot, touching my hip, often accidentally calling me his girlfriend's name. , putting his hands on my shoulders, etc. Recently, after a class together, we went and explored the science building at my school. We discovered this pitch black x-ray room and the guy pushed me in with him, even though the space was only like 5x5 and completely dark. I feel like, if my boyfriend did that with some other girl, I would be really jealous and wonder what was going on. This all made me feel flattered and, of course, a little bit guilty, seeing as I'm friends with his Girlfriend. The thing is, I really know that he's not a "player type" and he would never cheat on his Girlfriend - I know he's an honest and good person.

I just don't know what to do now, since they broke up. Should I eventually make a move, considering all the flirting? It's the first time since we first became friends that we're both single at the same time. If I should do something - how long should I wait?

Honestly, it's very awkward right now, because he and his girlfriend are in that ambiguous stage where the relationship is phasing out; they insist on being friends and whatnot. I'm kind of afraid that this break up won't last. His Girlfriend told me that, the night they broke up, he said he'd been thinking of initiating the break himself - but, now, he's being clingy with her. I'm just really afraid that they'll get back together because of this clingyness and I'll lose my chance to finally tell him how I feel!
The guy I like just broke up w/ his girlfriend. What should I do?
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