Mother in law issues ?

Currently had a miscarriage at 15 weeks my boyfriends mother came to my house to tell me to leave and go live with them. I agreed and went didn’t think much of it. First few weeks went well and all of a sudden fights started happening over nothing. She would start saying that he doesn’t spend time with the family etc. she would even fight over him not bringing her a burger. She would always criticize my cooking although she never cooked, I took the responsibility. She would even throw away the food I made straight to the trash. All the house chores were on my shoulders including his parents laundry. I asked him for us to move out his answer was “I’m not ready”. She would always be in our room talking about work (they would in the same place) . All of a sudden the title to the car he bought me went missing ? No doubt in my mind she took it . Before I moved in One night I slept over at his house he had looked the door the next thing I remember waking up to a body looking at us. It looked like his dad, I just think it’s crazy how they go and open a locked door. Am I wrong to leave him for his family not respecting our relationship or is what has happened okay ?