Why he's not responding?

He's been the one pursuing me. We've been on two great dates. Nothing physical has happened, but he knows I want it and he sounded more than eager to step up the level for our next date. He asked if I was available like a day after our last date and I didn't respond til a week later, and I texted something random (about my back tension, in an attempt to give him an opening to say something flirty, ex: maybe I should help you, etc) but I got a boring response...so I texted back on the same topic. Now he hasn't text back since then. I don't know what's going on, we haven't talked much all week. Is he not interested now or maybe he's just busy? I really don't want to have to text again or ask him to hang out...he knows I"m not the type and that I like him to be assertive. What should I do? I don't think it's worth it to cave in and pursue him, he knows he has to take initiative, but hasn't yet.
Why he's not responding?
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