Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/MeatDilemma on 2023-07-11 00:28:07+00:00.

Please forgive me for bad english.

I (30m) have been a carnivore my entire life. I love all types of meat: beef, fish, chicken, pork, etc. I have been dating gf (27f) for 2 and half years now. She knew about my cooking and eating habits and never had a problem with it until now.

About a year ago, she decided to become vegan. This isn't a problem for me and she has never pushed her diet on anyone, including me. When we eat, we make 2 separate dishes for each of us and then eat together. I've helped her make her meals, and she has helped me with mine. Don't worry, there's no cross contamination and we use separate dishes and separate utensils.

We have been having serious talks about moving in together when my lease ends and it seems like her attitude on diets has changed. During dinner, I told her about a new meat thermometer I ordered online that just got delivered. I was excited because it connects to my phone so I can see the temperature without getting off the couch! She told me to return it because once we live together, she doesn't want any meat in the house at all. This was news to me, she had never said anything like this before. We tried discussing it and it turned into an argument and then a fight. On my way out of her place, she told me that I'll have to decide what I love more, her or meat.

I obviously love her but I don't think it's fair for her to decide what I can and can't eat. Like I said, this has never come up before and has never been a problem with meal prep. So my question is, would I be the AH for telling her that I won't change my diet?