What does he mean?

Take him at his word. He has doubts.

He might mean more, but I would continue for a while and see how it works out.

IMHO texting is not a relationship and can send a new relationship down the wrong path. At best, it's partial or incomplete communication. Either meet in person when it's practical and discuss and hang out together or speak on the phone, at least.

Also if you find that you get angry easily, you might need to work on that issue.