I agree that counselling would be a very good idea.
I know my post could sound as if I'm suggesting that you "go soft on him". I don't exactly mean that you should let him get away with it.
But from what you have said (and the way my husband has behaved in similar situations)he feels backed into a corner, so is blanking the situation, because if he accepts "getting severely reprimanded" by you, he loses all control and sense of self worth and would feel sort of castrated.
So, you may well be able to get him to come back into this situation by allowing him to come in and properly pull his weight now, rather than forcing him to eat shed loads of humble pie first, the prospect of which may well be scaring him away from the situation and from you, altogether.
I suspect that underneath his supercilious facade, he is absolutely horrified about what he has done - but he is scared that you are so angry that he doesn't dare to expose his vulnerability to you.
I understand that you probably want to beat him up - I would.
But it might be worth trying a new tack (if it isn't working after a week, give up and beat him up). If it means that you end up getting on with each other and you stop having to sort this out alone, it will be worth it.
Yes, I reckon all the stuff about having another baby is about getting back at you for being so furious with him and about being able to retain some power in this situation.
I wouldn't talk about it at all at the moment - he may end up backing you both into a corner where he says things he doesn't mean, just to get back at you, feel that he has some control.
Anyway, now sounds like the wrong time to be thinking about this.
BTW, I also agree with those saying it might not be a good idea to take out a mortgage at the moment.
Mainly because I think you two need to sort out your relationship and how money works within it first.
Best of luck, whatever you decide to do.