My (22M) girlfriend (22F) reacted weirdly to me asking her about an account she follows

This is very long and I apologise. TL;DR at the bottom.

Girlfriend follows mainly girls on social media and the few guys are people I know of or mutuals. Saw an account (ik im in the wrong for checking in the first place but in my defence our relationship has been like this i.e. she was always very strict about me having female friends and made me distance from alot of them) that had a bit of a dodgy name and she followed them back even though they only had 27 followers.

Asked her who it is and she said she doesnt really remember must be some acquaintance from school. I gave her benefit of doubt and took her word for it because why would she lie. Later I had a gut feeling so i did a bit more digging. Turns out she not only follows this account on instagram, but also on tiktok (which i feel like is quite personal). but even at this point i wasnt too suspicious.

A few months ago in her university she started this society/club and told me to follow the society insta account and asked me to get my friends to follow it too in order to increase the followers. I saw that the account i was questioning also
followed the society page.

So my thinking was she clearly lied about not knowing this person because she has closer friends that i know about (e.g. ex work colleagues and old school friends) that she didnt ask to follow that uni society account but this random account with 27 followers does follow the society accoubt. the only reason i can think that would be the case is if she spoke to this person enough to actually bring it up and ask them (albeit its a bit reckless on her part)

anyways so i asked her and explained that i feel like shes not being honest. i tried to approach it respectfully. I did mention “if its xyz (a specific guy friend who i caught her lying to me about speaking to after he admitted he liked her)”

She started swearing at me and calling me “insecure” and started saying its obvious from the accounts name that its a girl etc. I told her regardless of the gender of the account my main issue rn is that you told me you dk the person and its probably a random acquaintance but they follow you on 3 different social medias including a society page u started a few months ago. after i explained that she just responded with “cool thanks” i tried calling but she didnt answer. This was the most overdramatic reaction ive seen from her and for once i dont believe i attacked her or made her feel shit in any way and i communicated what i needed to say to her and she disrespected me in return so this time I didnt message her with a paragraph apologising because i had nothing to say.

I assumed she would atleast speak to me because since october 2023 we’ve not gone more than a few hours without speaking. This time i didnt beg for her forgiveness after a “fight” (if you can even call it that) and now its nearly been 2 days and shes not said a word.

She has been very busy with her masters but at the same time shes never gone a whole day without speaking.

Side note she has been acting strange since she started her masters which i had been giving her benefit of doubt in saying shes got a lot on her plate (which she does tbh). Things like barely having time for me and when we did call at night she’d be very easily irritable and pissed off. i asked her about that and she said “i feel like ive grown and you havent. like sometimes the convos you have or the jokes you make i just dont like them anymore and find cringey sometimes.” she barely says she misses me or loves me. If im too busy to call before bed sometimes she wont even say goodnight before sleeping.

TL;DR – Asked gf why she follows a specific account on 3 different social medias. Her reaction was to call me insecure and swear and then not message me for the past 2 days (the longest we’ve not spoken since 2023).