It feels like something a little deeper went on than an argument. What reason would she have to rat you out?
I can see if you cheated on her or did something super shitty. But an argument isn't usually something that causes snitching or needing backup just to stop by.
Let me just put it this way. I have been lied to for 5 years about certain elements that make me question if I ever knew her at all. The last argument was just the straw that broke the camel's back, I guess. The fact that she escalated things this way when I was the one who was wronged cast her character in true colors. I have no reason to trust someone who would tell mutual friends of hers and mine that I threw stuff when I damn well know I didn't throw one single thing. Not only have I been gaslit, she is also gaslighting other people, IMO, because she feels like she needs to manipulate to get her way, or whatever. I am ready to stop psychoanalyzing all her fucked up decisions and focus on my own psyche. The more I evaluate this situation, I start to realize more how I have settled for less than what I deserve, and I can only imagine how exponentially worse things would be if marriage or children were involved, when I am bothered about just our pets being anxious. These are the behaviors of someone who puts herself first. She has essentially been deceitful for self-gain and selfish reasons.
So of course, it's incredibly difficult to summarize 5 years of relationship in an online post, particularly when the intent with posting was mostly just to cover my ass, in full acceptance that this relationship is over and I am already facing the heartache head on instead of the alternative she presented - taking a "break" which I know isn't real, during the inopportune time that she has breached my trust in a way where a simple impasse like ignoring my text shatters my ego. Dude, nobody in a 5 year relationship should feel this way. My entire world view has been shattered by all this.
I hope you don't take my reply at all the wrong way. I am still grieving and upset of course, naturally doing my best not to project this anger and sadness on other people. I am just trying to be as honest as possible. It's tough opening up about this even with strangers online. Typing the words means I have to accept it. I don't feel ready to end this but I do feel it's the right call. Thank you for questioning things though. It's important for me to scrutinize my point of view - not just validate it, considering healing and self-improvement are my goals.