I Am a Stepmother

I'm done step parenting. I give up. I understand it's a thankless job but I shouldn't have to tolerate this. Why on earth should I watch his daughter while he is at work if she explodes in anger when she is caught in a lie or told she can't do something? When he gets home he gives her sympathy and I'm the bad one. He would never tolerate her yelling at him the way she yells at me. I'm tired of no consequences for bad behavior. She shouldn't be in one of the best moods I've ever seen her in to the point it was so over done it was making sick. She has no accountability for her actions. None. After I apologized to the neighbor yesterday in case they thought I'm ok with letting kids do what my SD and their daughter did they actually did the majority of the talking. They told me bunches of things about SD they are upset about. You would think her dad should know about this. But I can't tell him because he would just get angry and that's when I finally realized things won't get better. At least he wasn't yelling at me with his daughter like he's done before but that's not enough improvement in 7 years. I'm so angry but so sad. I love him but I can't live like this. I can't put our 5 year old through it either. SD is only 12. It's only going to get worse if she isn't stopped now and I'm the only one trying which is a useless task without her dad. I feel hopeless. I don't know where to go. It will be hard for our 5 year old to not see her dad every day anymore but it will be even harder if we stay and get verbally and eventually physically abused by his daughter. I wish we could work on it together but you can't work on something if you can't admit that a problem exists.
We are supposed to go to the boat races today. It sounded like a lot of fun but I don't want to go now. I can't be around either of them. Wish I could go stay at my mom's house but she sold her house recently. I'd stay in a tent if it was safe but it's not. I'd stay in a hotel if I had the money. Instead I'm stuck here with this father and daughter duo. I got myself here. The life we live today is a result of the choices we made yesterday right?