I (33M) closed on a house today. This has sparked a massive argument at home because "I do things by myself for myself"

Background

I am a United States Army Veteran, still in reserves and full time Engineer. I have worked very hard throughout my life because I grew up very poor. I moved in with my GF in 2021 and had a child with her early 2022. Up to 2023 we split bills (I was in school for engineering up to June 2024) and after that I have paid for everything in the house because she wanted more time with our baby.

Last year I started working as an Engineer, I got a well paying job and finally got service connected. I am doing very well for myself. Since everything is going crazy with home prices I decided to jump on a house. I put 25k down, got all the paperwork done and closed today. Now, I talked to her about this since about 2 years ago and explained to her that everything I been working on since 2010 was for these 2 big goals of mine, my degree and a home. She is upset because I did not sign the paperwork with her and she told me "yeah, you did this so if we break up you just kick me out and thats it".

She is an unhappy person, always been since we met. No matter the situation, she has a complaint. She works and makes money, she complains, she stays at home she complains. She has been an amazing partner and has supported me with home stuff (chores, going to get groceries, appointments, etc) and she is the best mom my son could have (gotta say both negatives and positives). I have not asked for anything of her. I even offered to help her pay for her masters and pay for everything while she goes to school. I told her she can go back to work if she wants. I want her to feel free and not be stuck in a job she does not like or stuck at home. I told her I dont expect for her to pay anything related to the house and if she goes back to work at most just pay for child care and maybe some of the food (if she wishes) and thats it. She is mad I did not marry her first because I am afraid of her taking half if we divorce but the thing is she already failed me once. The reason we have a baby is because she stopped her birth control and did not tell me anything out of spite (separate issue altogether, I love my son BTW and give him all the love and attention he deserves <3) so I dont trust her with these kinds of things anymore.

I honestly dont know how to feel, I always been an independent person and thats how she met me. She knew because we sat down and talked at the begining. I never had anyone to fall back on to so Im used to doing things for me and now her and the baby. I understand her point but at the same time I have worked hard for years. Its been long hours, blood, sweat, tears, I went to war for this and now I dont even know how to feel. I even tought about moving in by myself just so I dont have to listen to her everyday telling that IATH or that I am selfish. I have my own mental struggles as is and it hurts to be told that I am not enough. Enough of a partner, enough of a father or enough of a provider.

Sorry for the long read I just needed to vent.

EDIT: Grammar

EDIT 2: I been very communicative with her throughout the entire process, we saw houses together and the one I bought was based on all her inputs (size, rooms, location, etc.). This was not a decision made on a whim or out of the blue.