Well, first, it would be really hard to prove that you were the one that infected your ex girlfriend in the first place, unless she was a virgin. HPV has a tricky incubation period - the average is a few months but it can be years - so its very hard to know with exactness who the source was.
Second, 90% of people clear HPV within 2 years, so its likely you wouldn't be infectious now. What clear means is muddy, though. Its unknown if it means the virus has gone dormant, or if it has cleared the body totally, but chances are really good that you are no longer infectious.
Third, your ex probably has no idea what type she had. Most people don't ever know that, unless she had a biopsy, and even then, it depends on what the doctor ordered. If she had visible warts, then she probably knows she had a strain that causes visible warts. If she had an abnormal pap, then she might know that she has a high risk kind that is liked to a higher risk for cervical cancer.
If your current gf has been vaccinated, then she is protected against the 4 most common types of HPV. That's really the best anyone can do.
My advice? Go to www.ashastd.org and click on HPV and read the most current research. You might be surprised at what you learn. A lot has changed in the last 5 or so years. Its now estimated that 80% of people will get this at some point in their lifetimes, and that if you've had 3 or more sexual partners, you've had it.
After reading the new research, you might want to let it go with the ex. There probably isn't a lot you can get from her that will help you. At some point, you and your new gf might have to move on, and just let it go.
I'm not a lawyer, and can't advise you of any laws, but I can't think of a law that would allow you to see her medical records in this, for the reasons I mentioned above.
Let us know if you have questions after reading the info on asha.
"In those times you seem to forget, I don't mind reminding you that you are a beautiful soul." ~ Cindy Campo
Paragraphs are beautiful things.
You can google, too.