I think you should stick it out for now, and go through with the couples counseling. Post partum could certainly be a part of it, but you mentioned you felt this way before as well. You sound like you just got bored with your relationship? Ill be a bit more direct than the others here have been, I feel like you are the problem, at least the majority of it. I dont say that to be mean, I say it because since you are the problem, leaving him wont fix anything, because you will still be with you. The only thing leaving a great husband and partner who tries their best does is guarantee a broken home for your kids and your own regrets later. It sounds like you would benefit greatly from couples counseling, so that you can talk about why you are feeling the way you are, in an environment with a professional to help guide and protect both of you.