development on the situation: apparently, one of them was speaking about the tension between me and the other housemate, and she mentioned the things I said to her the night before.
a problem with this housemate because she is really untidy and would leave a mess wherever she does. Her cutlery and plates wouldn't be clean for a few days after use, and it'd take up space around the house.
does keep nagging her and stuff, and fair enough that it probably sounds a bit harsh at times, but having to keep reminding her to be more clean, etc. does get tiring and repetitive.
yes, the other housemate can see it from both sides. She thinks that we should all sit down and get these issues off our chests, which is understandable.