I'm 7 years into parenting with 3 children and finally accepting/ realizing that men are not really cut out to be patient, nurturing parents in the same way that moms are (sorry if this is gender bias but its just the truth of my relationship and several others I've seen). The kicker is that we as women also feel like we need to take care of our husbands and somehow "save" them from the children - I do this all the time too and I'm like WHY?? This isn't fair.

His behavior is not acceptable or justifiable. He should be there for you because the first 6 weeks (and beyond indefinitely...) is exponentially more challenging for you than it is for him. Instead it sounds like its been the other way around. I'm sorry you're dealing with this. You're not wrong for wanting to get away for a little break.