You need to be careful here as you have a child.
Is he paying at least child support? If not, get a court order immediately for that. Alimony may not kick in until you are D, but meet with your attorney to get something for now, at least temporarily.
You now need to co-parent with him. And based on what you posted, it will not be easy.
This is why you now need an attorney. And possible legal agreements and/or court orders.
You want to prevent him from moving and taking the child. You want to prevent him from dragging you to court every time you disagree with him. Which is why you need an attorney. ASAP.
Not trying to scare you — just trying to prepare you.
I also agree that you need to stop talking to him. He can text you — and you can choose to respond or not.
Honestly his hot & cold behavior - suddenly moving out, demanding attention etc makes it sound like he is on drugs or drinking or has some mental health issues.
Your role right now is to protect your child. I know this is hard. I was in your shoes as well — my H was kicking me to the curb two weeks after Dday to be with the Other Woman ((OW).
Get yourself some counseling as well. It will help you save your sanity. It will provide you with support and guidance. Read up on the 180 - where you are not his wife any longer and he no longer calls the shots.
As a friend — I would suggest you NOT reconcile with him right now. He has NO reason to blame you for anything and I fear you will be further punished or victimized by him. A toddler doesn’t need to be exposed to that situation either.
Please keep posting here - you will get great support. Please continue to check in so we can support you. We care!