Let me preface this by saying I (30M) and my gf (34F) have been together for 7 years, we have lived together going on 4 years.
About three years ago, there was an incident where I was working at the same place as her brother and her brother's girlfriend had accused me of cheating on her. This has caused great conflict over the course of our relationship. Because her brother and her father still believe I did cheat on her and they hate me. I have told her multiple times not to pick me over them and she still did. I've always felt like deep down she's always believed them even though I proved that it did not happen.
It hasn't come up in quite some time. But seemingly out of the blue just two months ago, she accused me of cheating on her claiming that she saw a chat on my phone open multiple times and that she believes, I was cheating on her with the person I was talking too. For some reason, she was very focused on the fact that the chat background has a green color. My friend and I share a mutual favor of the color green. There are multiple things on my phone that have the color green. The person is a work friend, and I offered to let her read the chat she Refused but claims that she believes that I was not cheating and she was just being paranoid. It's worth noting that I don't lock my phone at all there's no password, there's no secure code no biometrics. You just scroll to unlock it. Simply because I never leave it unattended when i'm not at home and when I am at home, I don't have any problem with her going through it. Because there's nothing to hide unless she wants to look at the things that I considered getting her for her birthday/christmas and having the surprise ruined. Things were fine and then for some reason, two weeks later. Once again she saw I was talking to this work friend and she accused me a second time because she saw the color green. I've spoken to the work friend about it and we've agreed to not speak outside of work to make her feel better as much as I don't agree with that. But I more or less, told her during couples therapy, which we've been going to, to work on our communication issues for about a momth that if she accuses me again, that's it I'm done.
Well today it happened. My girlfriend is the type of person that I always know when She's upset because she shuts down pushes me away and if I ask her what's wrong, she says she's fine, but I can always tell by her facial expression and body language. I sometimes because i'm a dungeon master and run multiple dnd games, when I have writer's block, I play with an AI platform called "AI Dungeon" to help me come up with ideas. This platform's logo is a little flame. Which I admit is suspiciously similar to the tinder logo at a glance. Just an hour ago, she accused me of being on tinder, while sitting next to her on the couch, making no effort to hide my phone screen playing with the AI shes seen me use many times. I showed it to her, I literally opened it up in front of her and showed it to her and now she's sorry. But at the same time, this is the third time.
I'm not hurt anymore. I'm just angry now. I took her to work and dropped Her off came home made my dinner. Because I work night shift tonight, and all I can think about is how badly when she walks through the door I want to tell her to pack her things and leave beforr i get home tomorrow. I don't know what else i'm supposed to do at this stage. What am I supposed to do?
TL;DR: Girlfriend has accused me multiple times of cheating. Despite the fact that I have proven that I am not, and I don't know what i'm supposed to do at this point