Is AUTHOR wrong in the post ? POST : This happened literally today so the events are pretty fresh in my mind. 

My SO and I had just finished a class together (important detail: we came in separate cars) and it was dinner time so we both decided we were going to get Uber eats delivered. I wanted Vietnamese and she said earlier she would get a burger. 

We separated to our cars to drive the 30mins home. I looked online and saw that the Vietnamese place had closed. I thought 'shit, well my SO is getting a burger so I'll just get that too'. Placed my order and drove home. 

The order was literally waiting for me on my doorstep when I got home so I went inside to eat. I usually drive a lot quicker than my SO (plus I was driving quicker because I saw the Uber was on its way) so I didn't think it was weird that she wasn't home for 10mins after me, enough time for me to eat my burger. 

Que her losing her shit because I didn't contact her about getting her a burger too 'when my plans changed'. I asked why she didn't get anything on the way home herself, she said that she visited someone on the way home and was waiting until she got home to decide what to eat. 

I argued that this is the exact same thing as she is accusing me of: not contacting the other person 'when their plans change' 

AITA or should I have contacted her when my dinner plans changed? 