Wife vs Girlfriend. whats it all about?

I've read a couple of things on here, which has led my to wonder. I see a lot of women, saying stuff life "if he doesn't propose and you're doing all the housework, you're getting ripped off", or "thats wife duties not a girlfriends" etc etc. And this makes no sense to me, and maybe its based in culture, but why does it matter? I've also seen men talking about it a similar way.

Isn't a partnership a partnership regardless of having it on paper and on a finger? I can understand wanting to marry, and all that, but why does the title matter?

Wife vs Girlfriend. whats it all about?
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