Why do girls accuse guys of doing things that the guy never even did?

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6 mo
I was in a long-distance online relationship with a girl I met in a chatroom, eventually she started accusing me of things I never even did, and when i tried to be honest to her, she never believed me, it got to the point where I felt like my brain was tying itself in knots, so, I ended up telling her that it was over, it felt so cathartic.
Updates
6 mo
I had some pretty heated arguments with the girl, I was totally honest with her, I argued my case till I felt like I was turning blue in the face, her response was "Whatever!" every time I proved my point, I wasn't trying to be narcissistic about it, I was just trying to be honest with her, that's all, but, she would always twist it around, so it was in her favour, guys, ever had that happen to you? anyway, I'm glad I ended my relationship with her, and i tried to be really mature about it too.
Why do girls accuse guys of doing things that the guy never even did?
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