He is interested in you, that much is obvious. But INTJs do not like to make promises they cannot keep, especially when it comes to something as sensitive as a romantic relationship. As stated before by other INTJs here, we express our affection through actions a lot more than words. So if you are waiting for the words, you won't hear them, not for a long while anyway.
INTJs do not fall in love the same way NFs do. There is no "love at first sight". INTJs become interested, then they make gradual steps toward getting closer to a person, then as they find out more about the person they either start falling in love, or they move on.
The only way for you to get an accurate answer is to spend enough time with him where you can both see whether this is worth taking to another level.
That's all there is to it.