My girlfriend crossed the line after we argued about her coworker — and now I might face legal trouble from my past

I’m 20M, and when I was a senior in high school (Class of 2023), I had a one-time hookup with a girl who was also sleeping with other guys. She got pregnant, and they assumed her boyfriend was the father — but a DNA test proved he wasn’t. After that, she never reached out, never came to my school or house, and I never heard from her again. I’m undocumented, so I stayed quiet, changed my number often, and worked hard to stay off the radar to avoid any legal or immigration issues. Fast forward — I’ve been with my girlfriend (19F) for a year now.

A few weeks ago, we had an argument about a 40-year-old coworker who was sending her flirty texts, emojis, and even taking pictures of her at work. I told her it made me uncomfortable, but she brushed it off, saying I was overreacting and that “everyone at work is just close.” We fought about it because I felt like she didn’t take my feelings seriously. Then, not long after this argument, she went snooping into my past.

She contacted one of the friends of the girl from high school and asked if the baby was mine. They told her yes — just based on gossip. Now my name is back in circulation, and if the girl or the state digs into this, I could get dragged into a paternity case, ordered to pay child support (even retroactively), or face problems with my immigration status. When I confronted my girlfriend, she said, “It’s my business to know because I’m your girlfriend.” She keeps going back and forth — apologizing one day, then saying, “Well, if it’s your kid, I deserve to know.”

I feel like I’m the only one with real consequences here while she treats this like drama. First, she dismissed my boundaries with the coworker, and now she’s crossing an even bigger line by digging into something that could destroy my future. I don’t know if I can trust her anymore or if I should cut her off before she does more damage.