Sorry, this message might be a bit messy, but I really need to vent.

I've been having "disagreements" with my friend who I'm going to live with for second year of uni. Long story short first she didn't want to pay the bills as she didn't understand where her money was going and then I had to explain to her that we're all contributing the same amount to it and that we're not "bullying her" into giving us her money. She even wrote a whole email as she felt like her opinion was being included even though we literally proposed her the idea and told her everything and basically the whole situation blew up. 

During when we first decided to get the house she said she wanted the ensuite and we all let her have it as long as she paid extra as it was quite a big room and she agreed to all of this at the start and that was fine. Well, this morning (the day I was originally going to move in but didn't I'll get into that later) her mum sends this long email to mine and my other friend's mum about how she doesn't want to pay extra for her ensuite. The reasons why just didn't make sense like "the sloping walls" as both our rooms are on the top floor and I also have sloping walls and the smallest room. Also how her extra space is inconvenient and means she has to walk more to get to her desk? and she said I should pay more because I have a big desk when I don't because it can't fit. She also made the point that I have my own bathroom what she means by that is that there's a bathroom on our floor that is next to my room, but technically not connected to it, but even the combined space of my room and that bathroom is still smaller than the whole of her room. I don't know it's just not fair to spring this up on us so late - also the email was sent to my mum and also my friend's mum, but she actually hasn't informed the other friend about the whole thing. This other friend tends to be in the dark about everything and rarely responds to messages or has done any organisation of getting the house/bills etc... She just neglects everything and has no opinion and is probably unwilling to defend my opinion, but at the same time she's not aware of anything, but she still deserves to be informed about how much money she is paying, but the email wasn't even sent to her.

Today we went to the house to unpack my stuff and there's this problem with the smoke alarm beeping that my other friend (not the one I'm "disagreeing" with or the idle one) just left the house and didn't fix or call anyone about it so we were left to deal with it, but we couldn't turn it off and even though we called people we were just passed forward without any urgency so we made the decision to take some stuff and go home, because I won't be able to sleep with the sound.

Later the friend I'm "disagreeing" with came because she was also moving today and actually managed to fix it so she's sleeping there the night. I'm moving in tomorrow now, but this email her mum sent is probably going to cause tension between us. I've been talking with my family and the other friend who got sent the email. My family, especially Dad and brother, don't want us to give in to her as we were planning to compromise so she would have to pay less extra, but they think she's been very demanding about a lot of matters since we decided on this house. She literally has a guitar and speaker set up and everything she has the money to pay extra yet doesn't want to.

My other friend is quite passive and kind of a pushover so I think she would be willing to compromise for the sake of peace, but I still think it's ridiculous after everything and how we made a tenancy agreement at the start to which she and her parents agreed to as well to then go back on their words. It's not even about the money anymore as a mature adult when you make these agreements you should take responsibility and go along with them and not just back out last minute when you're literally moving in the same day. It's not like I can say anything, because she's literally living in the house right now. 

She's just really annoying me right now. Everyone kind of is. I'm slowly growing to hate her, but I can't because I'm living with her for the next year. I ended up having a mental breakdown when I came back home, because I've just been so overwhelmed.