I'm (23F) staying in Spain with my sister (21F), who's a student here. We have to share her bed, and she grinds her teeth at night. I couldn't sleep last night, so I went to sleep on the sofa- too cold.

I crawled back into bed at 5. She kept grinding her teeth again. So, I just ended up snapping. I can't remember what I said but I think it was "ughhhhh STOP IT," she wakes up, says "fuck you," and goes to sleep on the sofa.

I slept until midday. She came back in, having had breakfast in a cafe on her own, and said I've been a disrespectful house guest. I accidently flooded her bathroom yesterday, I'm generally pretty disorganised and cluttered (i have ADHD), I haven't done anything to help out for the 3 days I've been here, and, apparently, I talk too loudly so the other people living here have been disturbed.

I feel fucking awful. She said I need to find somewhere else to stay tonight, before I fly back tomorrow. I called my parents, and they said I need to be the bigger person, clean her room and apologise. But I'm still really shocked. I'm in a foreign city, I don't speak the language, I don't know anyone here except her. I sensed she was getting generally irritated by my presence yesterday, so I was treading carefully around her. She gets annoyed by me easily. I really, really try not to be like this. But a lot of it is stuff I'm working on, and she knows that.

I'm meant to be on holiday. I'm meant to be out exploring the city like we did the past couple of days together. We have tickets to something at 5. But now, she wants me out.

Before anyone says I'm probably missing out details, due to her reaction, she's like this. She loses her temper easily and can be quite difficult to get on with. Part of me thinks she'll come back and apologise, but I dont know if I've blown it now because I lost my cool and said she's put me in a fucking awful position here.

Who's the arsehole here?