Why does my mom so negative towards me?

When I lived with her she was lovely. The nicest mom. Since I moved out 7 years back, over the last four years she treats me differently. She went out of her way to tell me she’s took me off a will. I didn’t want her money to begin with. She said she’s leaving it to the grandkids. I am not a materialistic type so I was like ok!

She goes out of her way to show she doesn’t like my fiancé. If he comes with me to her house. She asks him if he’s going out. Makes him feel so unwelcome sad. I am the youngest of 3 she makes their partners very welcome. An tells me about her bonding experiences with them. An says oh your partner should come over. Knowing she treats him badly.

Growing up people would say do I have a boyfriend yet. She would say no she doesn’t need one. Found it strange as you don’t need a boyfriend but I would have wanted one at some point. My whole family treats me like a baby extended to , I am 30. She I feel made them see me that way. They act like my mom is more important than my fiancé. My mom will say things like oh I know you better then he does.

It’s so immature. She’s 64 years old, married but I believe unhappy in it. Me and my siblings don’t talk, when I told her my sister unfollowed on socials she said oh no. She likes us separate, an when she sees me talks about their lives. But it’s like if they are not in my life idc to hear about it. If something good happens in my life , she will tell my sister especially if she hasn’t done that yet to bring her down. My partner got a promotion, when she left my house 10 mins later I got a call from my brother telling me I am working hard like he had his confidence knocked. So she deliberately called him to deflate him.
My brother now dislikes my partner for no reason. When I tried on a wedding dress , my mom was slagging off my fiancé saying why was my sister speaking to him at our house before the fitting. To me it seems she’s an insecure freak. Doesn’t want us to bond. How evil

Updates
9 mo
If we bond together she seems worried and freaked out. But pretends she’s happy. We only ever hung out once one to one. Which is sad really. My sister is influenced by her my sister even went against me due to what my mom says. She’s easily manipulated whereas I am not. I know I am getting the worst of the treatment. My brother isn’t intelligent enough to see the issue dismisses it and goes against me. He’s toxic as he’s always acted jealous towards me due to accomplishments.
Updates
9 mo
My sister and mother tried to sabotage my relationship. My mom even used the words I can’t tell you what to do. But proceeded to say you need to take your son and get on with your life. You only get one life. Yet she sits their morbidly obese moaning her husband does not fancy her. When me and my partner had a small fallout she would say oh has he moved out. We recently had bad health. Her response oh sad news it’s like I said he died. My nan travelled up last weekend. I was purposely not
Why does my mom so negative towards me?
Post Opinion