sorry to have to break it to you calig, but the guy told you he was tired and you should have listened...discussing girlfriend/relationship shit after a long day is the last thing we want to deal with when we are tired and ready for bed (especially if its borderline nagging)...im sure he cares about you and all that, but the guy was probably in bed and didnt want to discuss anything...you were only going to get bad news by pushing the issue...
women never have and never will understand certain things about men...you can call us names and accuse us of things, but the simple fact of the matter is that if we express to you that we are tired and dont want to deal with something right then and there, dont keep nagging...its going to end up with us telling you something we probably dont mean and something you dont want to hear...all in an attempt to get some peace and quiet so that we can go to bed.
fwiw, if you date someone with a kid for more than 3-4 months and they refuse to introduce you to their kid, even as a friend, then its time to bail on the deal or make it clear that you tend to date other people...when people dont involve you with certain aspects of their life, they arent worth getting deeply involved with.