Ok so it looks like for both hsv1 and 2, your results were greater than 5.0, which means you definitely are positive for both types.
Statistically, this means your type 1 is oral, and your type 2 is genital. Many people who have type 1, and then get type 2, have a much milder infection of type 2.
You aren't alone in not knowing you had it - a study done showed that 90% of those with type 2 don't know they have it.
So how did your girlfriend get diagnosed? Did she have symptoms? A blood test?
What does this mean for you now? Well, it depends. Make sure your girlfriend gets whatever testing she has done typed. Even if she has genital symptoms, she could have genital hsv1 if you give her oral sex. This means she could still get hsv2.
If they didn't do a culture with typing, she can get a type specific test like you did. Make sure they do an IgG test, not an IgM test. If her tests are negative now, and positive later, it's a new infection for her. If it's positive now - depending on how long she's had symptoms, if she does have symptoms - it's at least a few weeks old, and you may never know who gave what to whom.
And in essence, that doesn't matter. Clearly, neither of you knew herpes existed in your relationship, so there is no fault here. Herpes testing is rarely included in routing STD testing, so most often, when you're told "you tested negative for everything", it doesn't actually mean "every std there is". It means "everything we tested you for."
You should both read the Herpes Handbook. It's written by Terri Warren, who is one of the world's leading experts on herpes. It's also free - https://westoverheights.com/herpes/the-updated-herpes-handbook/
If this is a long-term, long-haul relationship for you both, nothing should change. She can still have babies, and deliver vaginally so long as she doesn't have an outbreak.
If you have any other questions, let me know. Try really hard to not fall into the blame game. No one ever wins that.
I also uploaded the results as my profile image