<human>: Can you provide a brief rundown of the text in within 3 sentences?

So my gf has always been clear that she wants to get married. All well and good as I thought I did as well. She has been nagging for about a year now that this is what she wants and she asks me for when I plan on doing it. This started out as a cute reminder every now and then but recently any time she brings it up, we fight about it.

Long story short is that she says its the only way she knows I want to spend the rest of my life together with her, and that since I have said that I want to get married that there is no reason not to do it very soon; we're talking less than one month here.

Her best friend got engaged today so naturally she brought it up and got very upset. I've told her I want to spend the rest of my life with her and that I will work out our problems with all that I can, but she says the only way I can prove that to her will be through marriage. I've told her that I can't possibly imagine that our relationship will be any different if we get engaged (we're recently moved in together, about 2 months). She says that if it doesn't matter to me, then I should just propose for her sake, to make her happy.

It frustrates me because I feel (and I've told her this) that she just wants to get married for the sake of getting married, and just because people get engaged, doesn't mean they're more committed than an unengaged couple. I know she loves me, but I know that I want to spend the rest of my life with her, and even though I've told her this, she doesn't accept it until some arbitrary ceremony some how "seals the deal". She's not believing me, the person she claims to want to marry. It makes me feel like she doesn't want to spend the rest of her life with me, but rather someone that wants to get married to her.

Any advice?
<bot>: gf has been pressuring me for a year to get married. I tell her I want to spend the rest of my life with her, she won't believe me until I propose.