Divorce Served After Mil Visits

Hi guys,
Need some perspective and help on how to handle my situation. So DH and I had problems after baby#1. Mostly trying to figure things out and also i had PPD and anxiety. Lot of other external things also contributed like moving with infant, new job, moving into a home *2. In short I had a mental breakdown and asked my husband to move out. Later we reconciled..

Now we have baby#2, since I wanted it. We had problems post- partum but this time I was well aware of the issues we had earlier so we were prepared, atleast I was. We had fights here and there nothing major atleast that is what I think. But DH doesn't talk about it openly , he will give this short blunt answers or hurtful replies , that would make me think “ what did i do” or “ why is he upset”. Our relationship was rocky but OK. His mum comes to “help” and within two months of her visit got served papers.. Granted, I did fight with his mum because she accused me of lying when my husband hit me and I threatened to call cops. Then the fight escalated with her. I guess she was the fuel to my already rocky relationship that was recovering slowly from postpartum. Im waiting for my MIL to leave another 3 months , hoping i can salvage this marriage for my children…

I need ur perspective.
TIA