<human>: Give me the gist of the text in a nutshell

Alright, here's the basics.  My girlfriend and I have been together for 2 years now.  She has been hinting (moreso plainly telling me) that she'd like to get engaged soon.  She is accusing me of not wanting to commit and half the time she ends up lying down on the couch facing away from me ignoring me out of anger.

Anyway, so I figure it's something to look into.  I had told her previously that my dad offered to give me my mother's engagement/wedding ring to give to her (my mom died when I was really young, so it would mean a lot to me) when the time comes.  Well she told me tonight she's not sure she'd be OK with that because my mom is dead and it'd be weird.  That's fine.  

Then we started talking about *why* we get engagement rings.  Apparently it is the man's job to prove to the woman that he loves her more than his material possessions.  Then I ask her what she gives me to prove the same, and she said "nothing".  "It doesn't work like that."

She then made a semi-joke semi-stab that if I'm not willing to get her a ring she'll go find someone else, "the next highest bidder" as she put it.  Which was a joke, I hope.  Or just her saying it out of anger.

Anyhoo.  She works a better job than I do and makes more money, yet expects me to pay 3 months of my salary for a wedding ring, and she expects to pay nothing.  

I don't know how to feel about this.  I really do love this girl and would like to marry her, but I see no reason to spend that much money when she's not spending anything on me.  It's not equal.  It's antiquated and sexist.
<bot>: Girlfriend wants an expensive engagement ring because I need to prove I love her more than money.  Is this normal?*