What is wrong with mother in law who is constantly critical?

All I can really say is you are not alone. My mother in law is the same to me she tells me rude stuff she treats her other son and grand kids better than my child. I have lived with them for over 2 years and I am going insane!!! My bf also tells me to forget it and he blames me! You need to give your husband some choices. He backs you up and stands up to his mother or you leave. I left my bf and i stayed with my family. He missed us and has changed. Just about all the time he backs me up. Its not 100% better but damn near close. She has made up her mind about you and that will never change but what you need to do is get your man on your side. Good luck!