My ex is bipolar with schizophrenic tendencies and became paranoid and attacked me

My ex needs my help but he won't spk to me. He is bipolar with schizophrenic tendencies and became paranoid and attacked me. How do I get him to spk to me? We lived together and the house is still furnished with my stuff. My cats are with him to as I can't move anything now but I need to be able to communicate with him. He insists that I work through his mother to get my stuff but she told me that him abusing me was my fault so I don't want to see her.