It's very easy to do and also hard to know who is right when it happens. Did t say what we thought or did we mishear or was it a mixup of another kind. One thing I've found is that even when T has emailed I've confused what was said and been sure he said something that gave it a negative context; then later read back and found I was wrong and what I thought he'd said never happened. at least there I had something to look back on though.
Doesn't just work that way either; I know i've said things to T's in the past that they have remembered very differently to what I've said. Part of why it's good to talk when we feel hurt by something and work out if what we are feeling hurt by even happened