Hi Katy,
If he never initiates conversation or gives quick and short responses to your texts, there is a good chance that the feeling isn’t mutual.
If he was truly interested, he would have set up a more official date with you after that “catchup” date.
He may not have found the kind of connection that he was looking for on that “catchup” date. So yes, there is a good chance that he is only responding to your messages out of politeness.