Really? Disgusting? Outrageous?
And you can just discount his feelings?
Yes, he may just have thrown his rattle of the pram and acted selfishly, but is it necessary to tell a brand new mum that her obviously unsettled DH is disgusting?
OP, you need to tell him how angry, frustrated, scared you are. But you also need to listen to his reasoning and try to put aside your fears and support him in putting back together what his actions have torn apart.
You say you have spoken about it before... is there a chance that you have missed a signal? Maybe he tried to say something and couldn't... and now has reached burn out. I don't know, but you might!
He has said have faith. You are entitled to tell him how hard that is to do and how it makes you feel, but, in the end, you have no other choice but to leave it to him to sort.
You only really have 2 choices, continue to resent him and work yourself up about it, or take a very deep breath and support him in working it out.
And stressing yourself won't change the job outcome, but it could make you ill.
I know, simple to say, stating the bleeding obvious. But I really don't think the 'He's a bastard' posts are helpful right now!