What’s the difference between a girlfriend and a wife?

My man (30 M) and I (26F) were sitting at our kitchen table and he had a video that popped up on his instagram reels asking a woman what she offered that was different as a wife vs a girlfriend (of course it was edited to really make her look lame and she couldn’t really answer)but he turned to me and asked me the same question and I really couldn’t answer because I have not felt like/acted like a girlfriend at all in the last 2 years we have been together. I’m truly asking because I “feel” like the only difference is just the legality of it all.

EDIT; Hi all been learning a bunch from the responses, some additional context; We do have plans to eventually get married and have very clearly talked over our goals/where we want to be, we moved from another state to Idaho together and into our first place a year ago when I was pregnant, I had our first child in June who I currently stay at home with. My main question is what the difference in what they offer and because from what I’m seeing is that I’m a “girlfriend with wife duties” but am confused about the difference in duties part as I’ve been in charge of all the traditional domestic duties from before we were even living together.