Conflicted about my relationship W/ my sister.

So My sister (19F) and i (23F) just got into a really heated argument last night, and idk how to feel or what to do… prior to last night we had been working on our relationship and trying to recover it from a really big verbal AND physical fight we had almost 5 years ago, which the end result of that was me jn a surgery room because she meant to break a glass vase over my head, missed my head and completely severed the tendon on my hand instead. i’ve had mobility issues since then, but alas we mended our relationship as best as we could, and i hold just a tiny grudge over it still (because my hand isn’t fucking normal anymore duh lol) but other than that we get on fine.

i’m going to set the scene: we recently moved into an apartment, we had been used to staying in a house all of our lives, with our own privacy, we had many fights in that house, but the police were never called on account of our neighbors for being disruptive because a lot of other people had fights and screaming matches in that neighborhood too. i mean we’re human right? anyway, she also started working a warehouse job and we both don’t have a car right now so if she’s not catching a ride from her bf she’s catching the bus, and i always catch the bus or use taxi services. Important to note that MY bf lives with us and has been for almost a year since before we moved from our house because i was shouldering the rent and bills and other expenses all alone even though she was perfectly capable of getting a job and helping me. so since my boyfriend needed a place to stay and i needed help with rent and other bills we decided for him to move in and help and he’s been doing so ever since. My sister was previously working at a pharmacy before but then got laid off and didn’t find another job until about 3 weeks before we moved out. i had been working 2 jobs just to maintain the $1500 rent on my own and other expenses (including giving her money for food and other things) for about a year and a half. and i’ve been paying that same $1500 rent alone since i was 18. With the warehouse job i can see has been stressful on her, she works a double almost everyday so she’s gone for a while and gets back late. She does have a house key but she misplaced it and has since been banging on the door instead or calling us to let her in. •we have a doorbell idk why she doesn’t use it lol• So last night she gets off of work and comes home, i was at home for like an hour already, i worked a double as well at my job so i got back late. She called me, and instead of picking up i hung up and immediately went downstairs to open the door but before i could even reach the end of the stairs she started banging obnoxiously so i yelled out very loudly and said i was coming down. i get to the door and immediately ask her why she was banging on the door that hard. she always talks about how the walls are thin and everybody can hear us but she always bangs on the door so loud? so i don’t get that. anyway she says that she calls me and i didn’t pick up and i should’ve just picked up and said i was coming instead of yelling out but as soon as she called i declined and put my phone down, hop up and go open the door. i wasted no time. again she didn’t use the doorbell so i wasn’t aware she had been trying to get in already. so im trying to explain why i hung up because i was coming down as soon as i got the call but she just keeps going on about how i should’ve just answered the call and how it’s not that hard etc. It then turns into a screaming match shortly after i heard her in her room with my mom talking loud enough for me to hear about if it was my bf and he calls i would’ve answered immediately (i don’t pick up anyone’s calls it usually takes people a few rings before i do answer because being on the phone makes me anxious and ive made everyone in my life including my bf aware about this) she continues on and starts cursing and things so i bust into the room and yes i was wrong but from there the situation just escalated. we were going back and forth and she isn’t hearing me out and she then asks me if im dumb or slow which is obviously an insult. so i told her that i didn’t insult her so idk why she had to do it to me and she says that it wasn’t an insult it was a QUESTION…..????? anyway i get super riled up because it’s not going anywhere and she’s not willing to hear me but just goes on and on and brings my bf into it, which is confusing because her bf has put his hands on her and they’ve been in so many fights and im always there to hear her out about it but i never bring it up in arguments. my bf has been so kind as to help me when my siblings that live in the same house as me took no initiative to, has not put his hands on me and is overall a calm person. anyway i end up going outside and walking with my bf to blow off some steam. i’ve done a lot for my sister and my family, putting off my own life and dreams to support them. meanwhile she’s saying how nobody answers the phone for her and how everybody ignores her or walks around her when she gets home and doesn’t greet her, which isn’t true because i always greet her when i see her, which isn’t often because our schedules are different so by the time she’s home im already asleep or at work myself. i really don’t know how to move past this- and i’ve noticed a pattern. whenever theres a disagreement between her and whoever else including me, she will go to her room and start talking sh!t loud enough for you to hear and when you react to it, she acts like the “bigger person” and always deflects and says that i’m supposed to be the adult and why am i acting this way when she goes behind closed doors to say hurtful things then acts confused when you have a reaction. she takes low blows and then acts like you’re crazy. throws rocks and hides her hands. i understand her frustration of always being at work but ive been working all alone since 18 to support my entire family, so that my siblings can finish school, and when they DO have jobs they just spend money on themselves and don’t help me, then turn around to ask me for money when they’ve ran out. and while she says she recognizes the sacrifices i’ve made, her actions tell a different story. she’s just now recently having to pay a portion of rent, because her, my bf, her, and i split the rent 3 ways now since we’ve moved. i don’t really know how to feel or if i should even approach her about this because i feel that she’s going to be dismissive anyway. Any advice or commentary would be helpful