So you live about 100 miles away, and he knows your last name and the city you live in right? So, given the modern age of technology, it'd be a whole five seconds of effort on his part to pick up that handy always-on-your-person cell phone and get your number and give you a call.
Or you could do exactly what you said (and nothing more) and contact him the next time you'll be in town and see if he'd like to take you to lunch. I don't know if I'd consider that "persuing" him, but you could at least do what you told him you would do.
This sounds promising so far....
I'd send him a friendly message and give him obvious-enough signs to indicate that you are interested in something romantic, and see how he responds.
Why in the world are YOU trying to pursue him?
He should be pursuing you! Please remember something, if a man wants to be with you...he will move heaven and earth to do so. Men like the chase and to pursue...and not the other way around. If he wants to be with you, he will make that known. I think however distance is a big factor in this case.
This guy seems to be taking you for your word, and because of the distance isn't making a move.
The only way to find this out is to contact him when you are actually in town. He probably thought that you were being friendly and didn't think anymore into you two meeting.