I(19M) and my girlfriend (18F) had a argument about something happend on last monday for context we kow for like 1 year we're dating like 3 months now. She is a very sweet girl who is full of life and always has something to talk about. we have a lot of good memories and a strong bound,I was always by his side in her most difficult times and no matter what, Im always the first person she called in a difficult or extreme moment. (It all started on a Wednesday morning when she witnessed a suicide. She called me as soon as she got out of the station and I went to her immediately. When I went to her, she hugged me and started crying. We have had a very close bond since that day. Since I go to the same university with her, I can spend time with her all the time. I never get bored of listening to her stories and what's going on in her life. We study together in the library every Tuesday. We go out for drinks on Fridays and relieve the stress of the week together.I enjoy every single moment i spent with her.)

At this point in my life I thought everything was fine (I am a medical student at one of the top schools in Türkiye, she is in the same department as me)
until last Monday afternoon I received a strange text message from an old friend that made me nervous and scared. two of my old friends from art class they said that they organized an event to bring me and my ex-girlfriend back together(?) Yes, they clearly say it like that.I refused but this made me very angry while this happening she was sitting right next to me studying. she noticed that there is something weird about me and started to saying things like ''I have to do something, what's wrong, want someting to drink?'' I told her what happened and all of a sudden she mentioned how much she loved zucchini and that she was going to eat zucchini for dinner I was already nervous and I told her so you don't give afuck about this she got upset and said that she was trying to calm me down by opening another topic I found this very ridiculous but seeing her upset tore my heart out and I apologized to her many times she didn't talk to me properly during the way back she said little things ''like let's go to that bar next time'' as I said before she is a person who never shuts up and is full of life I have never seen her so cold and she dont texted me since that day (I am writing this from the next afternoon) (should ı text her first? i already said that im sorry about it and she seems like she didnt ever care while walking home) AITAH for being harsh towards my girlfriend because she brought up another topic while I was talking about a problem in my life?

(english is not my first language sorry if theres any issue in my writing)