Man can be unpredictable. It is possible that he is wanting to keep his horizon open (that includes trying to connect with others from the past w/o any main commitment on the line)
Try not to over analyze what he may have said (actions speak louder than words at times)
Even though you have shared good times/memories from the past, life is such that people change to an extent/ their priorities change. If the the kind of a response you were seeking is not coming just move on and keep the found memories from the past.