It's sounds kind of like me and my first car (2001 VW passat). I loved driving the car. Getting behind the wheel was always fun, my friends didn't mind it, and I never had any complaints when driving it. On the other hand, I hated owning that car. It had crazy maintenance costs, needed repairs every other month, and wasn't quite the car I wanted. It sound like to me you enjoyed this girl in the sense of having a girl in your life. I'm sure she made you laugh, turned to you when she was need, and maybe even aroused you. You made her feel good, which in turn maybe made you feel good. But at the end of the day, there were still things like maintenance costs and breakdowns which made you realize she wasn't quite the one.