You make your girlfriend sound like a miserable, bitter curmudgeon who isn’t appreciative for anything you do or anything she has. 

When she’s not busy complaining or feeling like the world owes her something more, what does she bring to your relationship that makes it worth staying in at all? I don’t mean “What has she done over 8 years?” Where you to get to gloss over things and select high points. I mean what’s she bring to your life now?