M.-
Bless you for even asking, and bless your dear husband for at least being willing. You all have so much going for you despite what is against you.
I'm on the outside and it is easy to look at things from this viewpoint. . .I know you have your hands full with 3 children and being pregnant. Being pregnant alone is enough to make one extra emotional, irritated, tired, etc. Of course you know it will only continue after the birth with taking care of an infant.
Three questions I have: will your load be any easier without your husband, or will it just get harder?
Do you suppose your husband is experiencing depression? All of his behaviors you described are definitely symptoms of it. Maybe he just feels lost right now and is wanting to do or be more, but is ironically taking the opposite approach. He may be overwhelmed.
Last, how will this effect your children who have already been through such instability in parental relationships? How will this effect your husband who doesn't want to give up?
Focus on the years ahead. Get through this difficult time and the later years will be all the sweeter than if your marriage were just a piece of cake and your husband was the perfect man.
My parents used to have some real yelling sessions. A lot. Afterwards they'd always tell me that they were trying to work things out and that "divorce is not an option." You can't believe the security that gave me as a child and even now as an adult. They still drive each other nuts half the time, but their 50th wedding anniversary was such a moment of J. because we knew that they had preserved and helped our family and each other in a way that giving up and divorcing never could have. . .ever. We spent their 51st anniversary together this past December--all the kids, spouses, grandkids. There were tears of J. when we all gathered . . .there was no present or activity that could compare to those moments.
Hang in there. Start by writing 10 things about your husband that you love--or could possibly. :-) In my life, praying is what always helps me most.
Good luck. You're doing a hard, but GREAT job.
J.