Ok- after two weeks of going( mostly) dark, save for a few tantrums of my own towards him for his decision - he returned home this morning, carrying two bags of rumples clothes. Previously, he would tote neatly folded bags of clothes.

I don't know how I feel about this, because I was ready to pull the trigger and file for divorce. As much as I want to DB, I'm not sure what a path for regaining trust and reconciliation looks like.
We have been NC except for communication about the child. I canceled marriage counseling( he never contacted me to ask why).

I only know he's home because I saw this morning ring camera he carrying the bags in, then my son looked after he left.

My MIL said that he did talk to a lawyer. So maybe it's a legal ploy to look good during court.

Thoughts about what to do? Continue going dark/NC?

I still have strong anger and feelings of betrayal, I'm not interested in initiating contact. As you know, he is not allowed in the marital bed.