Your girlfriend moved to stockton to be with you and you're thinking of bailing on her? It's stockton. Thats quite a sign of endearment for her to move to the bowel of california for you. Sounds like a pretty good girl; my girlfriend at the time (wife now) would only move with me there if she had a ring on her finger, so we got engaged...heh. Which is a good thing, but you see my point.
Your at a pretty darn good school, maybe not UCSF's caliber, but still good enough to pass an overwhelming majority of its students on the boards. Compare the rates to out of state and you see that any Cali school has them on average beat.
And its just 2 years really, you can do that 3/4 year in a variety of places.
Plus, UCSF is gonna work your butt a whole lot harder than UOP will, and I hear they are very competitive. Dog eat dog, and a bunch of nerds to boot. You've got to good of a sense of humor to go to UCSF. 😛 Just kidding UCSF students, sorta. Heh.
Go Tigers.