Even a reply back after a week is something. Keep texting with him and see where he wants to take it... but more importantly, decide what you want. To see him again, or not?
A week is a fairly short time and based on his schedule I'd say he's got back to you pretty much as soon as he felt he could, so that speaks volumes for me. So do reply back, just in a friendly way -- "Yeah, been great thanks, how was ours? Enjoy your daughter's visit?" No more or less than that sort of thing.