Without going into too much detail, last year in the lockdown we were all at home with our parents. My sister was not in a good place. Constant rudeness, aggressive, tantrums over the smallest things. One evening when she got back from work I was sitting at the table on my computer minding my own business working. During that time she spent a lot of time deliberately trying to provoke and agitate me. I would just ignore her, there was nothing else I could do. Pouring water down my top, dragging her fingers along the computer, closing the computer in front of my face when I was working at it. Moving my cup of tea to the other side of the table, turning off the Wifi, taking the earphones out of the computer. One day after washing her hands she came over and flicked the water on the computer. This particular evening she came over to where I was sitting, started doing these kicks into the air next to me just to annoy me. Next thing I know, she had kicked my cup of tea right onto the keyboard and all my notes, which I had to throw out. Whether it was deliberate or accidental, I do not know. The spite afterwards was what really got me. Never apologised, sat there staring at the end of the table while I tried to clean it up, I was crying like an idiot. Since then she has never once apologised or shown some regard or accountability. It was not broken immediately, the next few weeks it worked but seemed to slow down and wouldn't turn on. She was doing the same thing with her fingers, dragging them across the keyboard to spite and razz me. One day it would not turn on altogether so it was sent to a repair shop. Nothing they could do, the thing was fucked. Second hand too. I asked if liquid damage could have caused this and the guy said yes. Now for clarification, I did not buy the computer, my dad did for me because I have started a course and needed something to work on. Since then I feel like I'm bottling in a ton of an urge to cry I can barely contain. I don't know why I'm so upset and why I can't get over it. It wasn't a person and I could always just get a new one. My dad has offered to get me a new one and I've refused. He shouldn't have to be paying for two when if it wasn't for sister I would still have the first one he was decent enough to buy in the first place. I can't afford to get one myself, and even if I could there'd be no point, it would be the exact same cycle with her, she'll do the exact same thing over. Months later I'm still really upset and don't know why. She lied when I told my mum about what happened, I am genuinely convinced my whole family thinks I'm lying about what happened, has never once apologised or anything, I don't know what I'm expecting to happen from being so upset, but I feel like I'm about to explode and can't contain myself any longer. What is wrong with me? AIBU?