Was I being rude and disrespectful to my girlfriend?

I was picking my girlfriend up at here apartment building for dinner and I pulled up to the front of her building and parked by to front door to wait for her. It usually takes her about 5 minutes to come down stairs as her place is pretty far from the front door. As soon as I parked, I saw a car parked by the door with its hood up and a guy sitting in the front seat with his all of his windows down. Nits was 86F outside. I got out to see if he needed some help. He did t speak English so we used Google Translator on our phones to communicate. I started to look at the engine, my girlfriend came outside. I walked over to her and told her that so would be just a few minutes and suggested that he go sit in my car so she could stay cool.

She got in my car and literally 3 minutes later, I was done helping the stranger and I got into my car to go to dinner with her. When I got into the car, she was extremely pissed off at me telling me that she felt “unseen” by me and that I prioritized a stranger over her. She told me that I should have immediately stopped helping the stranger and left with her to go to dinner. She then stayed silent all the way to the restaurant and then, when we got there, she told me to take her back to her apartment. When we got there, she got out and went to her apartment. I didn’t hear from her for 5 days. We then talked and she gave me more crap about it. I thought that was it and now, 9 days after the incident, she furious about it again and I think she’s considering ending our 1 year relationship due to this. She says that she felt “unseen”, disrespected by me and that she can’t get over that.

Was I rude and disrespectful? I’m just floored that helping a stranger which kept her waiting for 3 minutes could blow up into something like this and potentially end the relationship. Maybe I’m missing something so I’d appreciate any opinions from women out there. Thank you in advance for your perspective.
Was I being rude and disrespectful to my girlfriend?
Post Opinion