<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'll try to be as concise as possible. 

My girlfriend developed a UTI about a month ago, and the antibiotics seemed to work within a week. Now, for the past week, it seemed to be back and much worse. She is constantly uncomfortable and it kills me to not be able to help her, I don't know what to do.

Then, today, a nurse from the doctor's office calls her to inform her that she has a staph infection, which they found out after her most recent checkup which included a urine sample.

She's freaking out, and I would be too. A very close relative died of septic shock and it scares the absolute shit out of me. She didn't stay over tonight because she's scared it will spread, and she's scared I already have it. 

I've never dealt with this before. I always thought that staphylococcus was something was visible on the skin, and happened through cuts. Now I'm worried that I was infected and gave it to her through intercourse, and I feel like absolute shit. I really just want to be there for her because she's really freaking out, but I don't know what to do. I don't know how it spreads, I don't know what we're allowed to do and what we shouldn't do just to be safe.
<bot>: Girlfriend has a staph infection. We're both scared shitless and not sure what to do. I'm not sure I entirely understand exactly how it even came to be.