Just because she's your mother doesn't mean you are obligated to maintain a relationship with her. It's really hard to cut parents out of our life--I think almost everyone wants to have a good, supportive, loving relationship with their parents, and it can be incredibly painful to finally recognize that you're never going to be able to have that, through no fault of your own.

What's helped me is framing it as me acting like a good parent toward myself. I try to look at it as though I'm my parent. If I had a child, I would not allow anyone to treat them the way my mother treated me for most of my life. I would take them away from that environment and teach them that they're worthy of respect, kindness, and love. By taking myself away from the cruelty, I am, in effect, taking care of myself the way my mother should've.

I don't know if that resonates with you or not--it's okay if it doesn't. But you deserve to be treated with respect and kindness. You are worth that.