Trying to Decipher Dating Signals!

So, as I've mentioned in previous posts, I am doing the online dating thing. Well, I recently met up with a guy for our first face-to-face meeting. We'd been emailing eachother for about a month, but he's a first year law associate so he gets home late, which means we hadn't had a chance to talk on the phone. Finally, this past Monday we were able to connect on the phone. This lead to the f2f set-up for the next day.

We opted to meet at a Cosi's by his office since he was just going to be taking a dinner break and then heading back to finish some work. We had a pretty nice time. No awkward pauses in the conversation, a few shared laughs... all in all, a really great first meeting. It was at the end that things got a little odd and is what is worrying me now. You see, he walked me back to the Metro (since it was on the way to his office), but we just said goodbye. There was no hug, not even a handshake. Just goodbye and then we went our separate ways.

I sent him a text later that evening, thanking him for dinner and saying it was great to meet him and I hoped we could do it again soon and that I hoped he enjoyed the rest of his evening. He sent me a text back a few minutes later saying it was nice meeting me as well and that he hoped he'd get to go home soon. That was it. I didn't hear from him at all on Wednesday and then got an email late on Thursday. However, the email was just a continuation of the string we had already established. No mention of how "date" or questions about plans to meet again. I replied back to the string, then asked how his week had been, told him about mine and asked him what he was planning on doing this weekend.

So, now we reach the point of this post. I'm not sure how I should play this. Should I just admit that maybe he's not as interested? Or maybe he's just busier than I am (which he is, I'm sure) and so doesn't want to commit to anything for fear of having to cancel because of work. Should I put myself out there and ask him myself? I'm just not sure. This is only the second guy who's had any REAL potential, so I'd like to pursue it further, but I'm just not sure HOW far I should push it, you know? Anyway, I'm sending this out into the void... hoping that someone out there will have some advice!