I just realized that you were probably looking for a psychic answer and I can not tell you from that angle. But I do believe that there are no coincidences. Things happen for a reason..sometimes you can give them a slight push though and if it is meant to happen it will.
If you kind of liked talking to him, I would pass by his area as if you needed to and see if there is anyway you can start up a conversation..if that is too awkward, I would keep an eye out for him and see if you can connect in someway.
That is the best way to see if he truly is interested or just being nice and talking to you when he saw you. No focus on him (that always gets too weird) and another cross in paths may mean it is worth sending an email for coffee...