Most Helpful Guy
Maybe you could initiate more often to show that you have an interest there. By not making the effort, he likely thinks that you don't really want anything further
Most Helpful Girl
You could, you know, ask him.
Here and other places I've seen a lot of guys talk about how awful it is that they're always expected to be the ones to ask women and face the chance of rejection. Getting rejected sucks. He might be trying to gauge your interest before working up the nerve to ask you out because he doesn't want to be rejected if he can avoid it.
If you're interested in having a first date with him you could ask him out. If you too fear rejection, you can show your interest in him by taking the initiative and making the first text more often.