Mumma’s Boy

So I had a baby 6 months ago and also bought a house with my partner and I’m started to feel like second choice when it comes to my partner and his mum it feels like he doesn’t want to commit to me fully without having his mum hold his hand he refuses to be an adult and always goes to his mum for opinions on his work our house our finances our son and everything I say is wrong compared to what she says he won’t even talk to me about anything he just goes straight to her ... am I wrong for telling him that our relationship isn’t going to work if he doesn’t start being and adult with me and talking to me about our life ?

I feel so alone when he’s home he doesn’t get off his phone and getting a sentence from him is like pulling teeth but when he’s at his mums he doesn’t stop talking about work and his thoughts on things and what he wants to do our finances everything ... I don’t know want to do anymore I’m so unhappy and I’ve tried talking to him but it just turns into an argument because he refuses to let go of his mummy :/

UPDATE

so I had a talk with my partner and then he decided to go tell his mum that I don’t want him seeing her or our son and I don’t want her input on our lives and he full upset her I was so mad because my whole point of talking to him wasn’t to cut her off but was to make him realise that I want him to open up to me and talk to me about our life he basically told her that if he didn’t cut his ties with her I would leave him which isn’t what I said at all the whole argument had nothing to do with his mum it was him but he can’t see that he can’t see what he’s doing wrong ... I really don’t know what to do anymore I apparently can’t do anything right these days