Hello first AITAH post because I genuinely don’t know if i’m the ass hole and I want to be able to respond correctly to my gf

So first I have a gc with My gf me and 4 other friends they’re relevant so i’ll give them a code name within the story. Basically me and friend T and B were in a ft call and I was just calling them because I was creating something for my promposal. But, friend B and T was brewing up a plan to prank call friend M. So the plan was to *67 friend M (when you someone *67 your number will appear as No Caller ID) and say “Mama we miss you come home”. That was the prank so they did it but they didn’t only call friend M they also called my gf with the same phrase. Friend B, T and I were all in the gc defending our names and blaming it on friend M. So my gf calls me to make sure it isn’t me and I clear my name *note I did not call my gf for the sake of the story. After me and my gf got off the phone Friend B spammed called my gf keep this in mind. This made my gf phone glitch so she called the gc to start getting to the bottom of the prank calls. I was working on the promposal so I didn’t join till later. This is when I got caught because they asked me to screenshare and it showed me pranking friend M. Now let’s do a backstory me nd my gf was together all day that day. We had a study date and went to tropical smoothie and completed some work. But, I wasn’t really getting work done I was on my phone and slightly working. My gf finished most of her work at Tropical smoothie and she had business so we couldn’t stay but i wanted to finish my work. So we left to go finish her business and after she was done we went to starbucks. At starbucks I was completing work finally and she finished all the work she needed to do I didn’t. My gf was irritated because she finished her work and I didn’t but she knew I had a lot of work that needed to be done because I haven’t done homework for like a week. So, I finished a quarter of the work I needed to do before we left. She was already irritated because we stayed an extra 20 minutes for me to finish a quarter of my work. She let me know otw to dropping me off that she was on her cycle 🩸 and she was irritated and wanted to go to bed. Back to the original story after everybody figured everything out who was prank calling. We all hung up and I was finishing the promposal stuff. That’s when my gf called me upset because I “let” my friends prank calling her knowing she was irritated. Yes, I understood she was irritated but during the beginning she was texting in the gc like it was a funny prank. Basically she was upset at me because I didn’t call friend B or T to tell them to stop. But we weren’t even otp for me to tell them to stop. Because, I was prank calling my other friend to do the same to her.

AITAH for not calling my friends to tell them to stop prank calling my gf