*Update*Brother moving in with his GF

So my brother (37) told me he’s moving together with his girlfriend of 7 years and they are all set for next month. Upon telling this to my parent, my mom went insane, giving him ultimatums that if he moves on with his gf she wants nothing to do with him. He usually stays at his gfs over the weekends and has been avoiding going home to my parents today because he can’t face being confronted. My mom barely has had a conversation with her and dislikes her mostly the way she looks. (Not to my mom’s standards) my brother reached out to me to ask for advice and I’ve had issues with my mom too because I can’t take her controlling behavior. She uses guilt tripping and falls victim, crying to him and telling him he’s not appreciating all she’s done for him. I hate the fact that, she’s so manipulative and making his life miserable simply because she doesn’t agree with his life choices. He cried today because he can’t understand how vicious her reaction is even though this has nothing to do with her she’s making it about her. When I had my falling out with my mom, my brother would side with her but now he’s getting the exact same treatment. He’s afraid she’ll have a heart attack or something bad and feeling tremendous guilt. I did tell him, she has to accept his life decisions and it’s not up to her anymore. He has decided to move forward with his decision. I think my mom is extremely toxic and can’t see past her selfishness.

She’s made it clear to him he’ll never accept her and she’ll never welcome him home if things don’t work out. Is this not disgusting manipulation and self-serving? Would you sit down for a conversation and hope she’ll support him?

*update*

My brother has decided to break up with his girlfriend today. He says in his heart he knows she’s not the one.