AITAH for calling out my gf pettiness

She's been trying to argue with me recently a lot more than she used to, the first one was understandable I forgot to meet her somewhere. She got mad at me and started arguing with me about walking off because she was talking to her friends (I left my friends to hang with her) I didn't like the dude she was talking to, so I left (she knows i hate this dude and that was before we started dating) She messaged me a little bit later saying "would you like it if I abruptly left without saying anything" I said nah, but I'd understand your reasoning (I don't like arguing much) and that people leave me all the time so I'm not used to staying around and thought that was normal and didn't realize that she would have a problem with it. (I've done it before and she was fine with it) she started replying to everything with "k" and i stopped texting her. She said "my bad for complaining" I said it's cool. She said I was being sarcastic and I was like yeah, I'm tired of you being petty when I'm trying to work through things. She said she wasn't being petty. I told her the "K" stuff was petty and that it's rude whenever I'm trying to work through stuff. So AMITAH