Please stop justifying his behavior
Please stop believing that you are the cause for his actions
Please stop reminding us that he is not hitting you, only your young daughters
Please stop trying to put each action of his into a vacuum, and rationalizing it.
It is the whole picture which you must look at. You can sit here and type as much as you’d like, but how much more do your children need to take from their “father”?
Their emotional scars are only imaginable to us here in the cr, how much must their physical scars increase until you’ll have the courage to protect them? broken bones? emergency room visits? teachers calling social services?
Like I said before, you know what is right and you know what you need to do.
May Hashem grant you the koach necessary for this.
PS I have strong reservations about the diagnosis of PPD. At some point PPD ends and real depression from that which is your reality, takes over.