Dear OP,
Sorry this is late - literally and relatively - read through your posts and they left me so sad for you I can't sleep.
I am so sorry to have read through the situation that has fallen on you.
Couple of things - apologies if these have already occurred to you:
- With regard to his message - the lack of any apology is stark. "...can we get past "this"" he is minimising already.
Not "I'm so sorry I <screwed up/panicked at feeling old/insert pathetic excuse> etc."
- Text/call your MW and ask to be referred to your local perinatal mental health team. Most local health authorities have one. Not to sound like the sh¡te fairy, but I would imagine your likelihood of developing PND has just gone through the roof. Your local PN MH team can offer you free counselling (via Zoom if you aren't up to leaving the house in those early days) and/or medication and extra visits from the community nursing team (mine literally offered anything, from laundry to holding bubs whilst I slept, or playing with my older child).
- Legal guardianship of your children, life insurance and a will. Your solicitor might go through all this with you when you see them, but if not, this is a reminder to ask. I know this might sound a bit extreme, but you need to arrange in writing the disposition of your estate and who looks after your LO(s) if anything happens during your delivery. Otherwise, as your spouse he would automatically assume guardianship and you have already mentioned supervised visitation (IIRC).
I know that sounds horrendous, and unthinkable right now, but I had to make similar arrangements at very short notice during my 2nd pregnancy at 36w (different reasons, but it helped knowing that people I didn't want in my life/children's lives couldn't get their hands on my children or my life insurance/pension/house should anything happen to me). You can set up a Trust for your children and have your brother/SIL/parents as trustees if need be.
- This is a horrible, horrible thing to go through. Be kind to yourself, let others be kind. None of this was your fault.
There are circumstances, and there are choices. He made these choices, with every interaction with OW, with every lie he told you. This situation is the product of his choices, none of the blame is yours.
- Your courage and dignity is humbling. You are amazing.
Huge hug x