As delicately as I can say it you may be setting yourself up for issues because of the way you compare your past relationships to any new ones. You're so used to constant contact/feedback from the men you've dated and that you've basically immediately become a couple but it's also normal to not respond back immediately and normal not to become a committed constant contact the second you meet. Maybe this guy is just a flake, maybe he had second thoughts, but maybe he didn't. You don't have to wait on him but you also have to temper your expectations. It's not fair to the guys either here. Right now you're assuming the guy is just not eager to talk to you the moment his children are no longer in his care, I'd give more slack.
I'm totally for going on this upcoming date (and actually would suggest you do so) but I also had the viewpoint things aren't so serious in the beginning and for you it seemed that's really all you were used to and now with your updated stuff it's like you put the brakes on anything that doesn't meet the snuff of the past before you give it much of a shot