We aren't on the same page anymore and it's ruining my marriage

Me with the mother in law again.... The one living in the stupid garage like that's her only option in life.... My husband and I have been having a lot of fights about the situation lately and I honestly don't have any hope for our marriage anymore.

He's angry at me because he's saying I'm making it all about me, when it's not. It's about his mom and her health. It's about him having to help her, because apparently despite the fact that she has three other children, it's only his burden (and she's treated him horribly). Basically said he's disappointed in me because I didn't meet his expectations when dealing with his mom. And for the first time, he admitted that he's angry that I initially said she can come here for a week only. In fact, he said verbatim that I "the gall to say she could come here for a week". He expected me, despite the fact that I had ZERO relationship with the woman, to basically have an open ended offer for her to stay. Said I have too many feelings and again, it's not about me. Said I overreacted when I got angry at her walking into the room without warning or asking. Muttered some other stuff about how I need to start making proper money again so we can just get a divorce already. Got angry at ME, because he defended me and told her to leave when she called me a racist to my face. Asked me what kind of son does that.

Me on the other hand am now not only feeling like a shit wife because I failed to meet his expectations, but I'm also fucking angry he put me in this position to begin with. Forgetting what happened in the past, he still expected me to "fake it until she leaves" after everything she did and said now recently. He doesn't get it because she didn't say those things about HIM. She called ME a racist, also while calling me a racial slur and calling my family dirty and racist. She didn't mock the way he spoke, the way he cooked, the way he cleaned, the exercise he did, etc. Basically took note of everything I've done since she's been here to use against me. She didn't bring up his past in an attempt to make her look good and him look bad. She didn't tell him to leave when she was in the wrong. He can tell me all he wants that "when she attacks you, she attacks me" but it's not the same thing. It's MY name being dragged through the mud again. It's ME being humiliated and mocked. But I am failing to meet HIS expectations because he expected me to still greet her and be nice to her after that?!

Sooo sorry she might have cancer. It doesn't excuse her behaviour and I told him I'm not going to reward toxicity. They'll throw an 80 year old in jail for murder. Your age and health doesn't give you charge blanche to say what the hell you want about people and do what the hell you want.

So. I think I am going to move out. Because I don't want my husband to think defending me is a burden, and I am not prepared to even pretend to be civil with that woman. She's not my family.