Bo - I think you have the general idea and all I can say is my ex wife went through PPD and we had similar type problems that after about 6-12 months went away.
I thought all was good and my marriage continued for 28 years.
then menopause hit and now I am divorced.
So what I have learned is you are dealing with very powerful forces that are really beyond our control.
YES - have boundaries and work on yourself.
Sometimes you are a man only a fool would leave and they are fools.