Her and I were getting into arguments over (imo) trivial things.
I ask her politely every now and then to stop doing a specific thing* as yes, I do have OCD and some specific actions bother me immensely (and yes, I do actually attempt to be polite, I'm not stretching the truth here; I believe my exact phrasing this time was "I'm not meaning to be rude, but when I say 'don't', please don't"), and this usually ends up with her going "you fucking bitch all the time, you treat me like shit, you always fucking complain, you're just a fucking dick and I'm done with you".
When I attempted to interject, to try and explain that I was not meaning to be rude, and that all I wanted was for her not to do that one thing, she pretty much shushed me and went on to call me everything but a human being.
This led me to say "if you seriously think I'm the one treating you like shit right now, you are delusional and need help" out of anger, so I stormed off.
This happens often, this is just one of the rare times I stood up for myself. Normally she is great, but every now and then, it's like she has a sanity switch that she simply switches off.
How's that for the full story?
*For example, leaving prints on things, touching my possessions without asking me, bringing drinks into the bedroom, etc. Shit bothers me. I can't control it but it does.