Losing My Mother and Struggling with My Father's Abuse

Assalamu Alaikum everyone, I'm not really sure how to begin, but I’m writing this with a heavy heart, so please be gentle in your replies. I recently lost my mother and I feel so lost and deeply sad. It’s hard because no one around me really understands what I’m going through. I’m still young, and many older people in their 70s have their mothers and try to comfort me by saying that death is part of life and they get it because they lost their fathers at an old age. But it’s not the same. I’m young, my mother was still young, so they don’t truly understand the pain I’m feeling. The grief I carry is different. She won’t get to meet my children, her grandchildren, while many older people’s parents lived long lives. My mother had a very tough life. She was married before, and one of her husbands caused the death of her baby. My father is not a good man. She married him as a single mother, but throughout my life, he was abusive to her. He physically hurt her, controlled the money, and even violated her. Until she passed away, she was constantly under stress. Yet, somehow she always showed us love and smiled. Her health suffered a lot because of him, both physically and mentally, but he only blamed her and called her crazy. He never admitted his wrongdoings. Even when people told him to care for her and make sure she took her medicine, he ignored it. There is so much more to the abuse she endured; it’s too much to put into words. She lived through so much pain in one lifetime. The house was neglected too-infestations and all-because he never cared. I feel heartbroken that my mother had to live such a hard life, and I feel guilty. I wanted her to be here so she could live with me someday. It hurts that she had to go first, not him. My father seems unaffected. He acts like everything is normal, even happy, listening to music. I want to keep my distance from him. He calls and accuses me of being rude for not answering, but I don’t want to talk to him. She died because of his neglect. Is it okay for me to cut ties or keep very minimal contact with him?