ARRGHHH! How annoying!!
Text has got a lot to answer for, I tell thee! People hide behind texts these days instead of calling, which is why we end up in situations exactly like this one!
His non-committal reply could mean a lot of things; he's really pleased but it has made him coy so that was all he could think of writing back, or he wasn't in an environment to text properly so just sent a quick response.
Personally I'd think he was a complete waste of time by now! hahahahaha! Seriously. If you now stop texting him to see how long it takes him to get back to you, I bet you'll find that you don't hear from him for a week or two. Then he'll send another obscure text out of the blue! It's not worth the hassle. If a guy likes you then he should show it, and vice versa. You've accommodated his shyness and that still made no difference, right?