Am I being delusional or what? HELP

Ladies I just want to know what you think.

A man gets married and then has a wife, will his wife and his own family with her come before his parents/siblings then?

My partner and I have our own family and yet every time he mom cries wolf he goes running to her. It’s a constant irritation I do have because majority of the time there’s nothing she needs help with.

She just wants him home with her 24/7 but not us, she wants him to pay her bills and give her money and expects her to buy the groceries and take care of his siblings all 5 of them as well.

We were supposed to be moving into a bigger place, and I’m afraid he won’t even have the money saved up anymore since he keep handing it to his mom.

Every time I try and bring it up nicely he tell me “my mom will always be important in my life, she’s my everything and if I’m not there for her then I feel like a bad son”

He says that I’m not understanding anything and that I’m just being dramatic and over reacting?

I feel like his mom should understand he is married and has his own life and shouldn’t be bothering him for little tiny reasons just for attention.

I know she dislikes me, I have a feeling she’s doing it to get on my nerves because she knows he will listen to her whenever she calls him.

What do I do? Am I over reacting? What do I even tell him now? I’m lost rn tbh