In the end, that relationship failed for a multitude of reasons (like I said, I was a dumbass) -- but my attitude about her background was one of the biggest ones on my end. It became an almost toxic resentment for no clear reason: on the whole, she was a lovely, grounded person, who worked a campus job, earned her own money, and lived within her means as much as any college student. She was kind, and generous, and aside from the car (which I later found out had been purchased used from a friend specially for her 16th birthday), she made no blatant outward displays of her wealth.
The real issue, then, was that I placed a higher value on class and money than I ever should have. I grouped a girl that I loved -- and yes, through all that, I did love her -- with an unattainable concept of wealth and power that was just that: a concept. I clung to my issues with her money in an ass-backward attempt to mask my own insecurities.