Okay so I (17 F) and my mom (34 F) have had a rocky relationship for quite a few years now. a couple months ago I started staying at her house less ( it was originally week on / week off and is now only every second weekend). Easter weekend was her weekend but I wanted to see my cousin, who I rarely see, so I asked her if I could stay at my dad's for the weekend and give her a few days to make up for it and she agreed. A few weeks ago I had brought up watching a movie that I really wanted to watch with her and she promised me that me and her would watch it the next time I came home which ended up being Monday. So on Monday I went over and spent the day helping her sort through her wedding photos as, she recently got married, but it really just ended up being me going through them and her just sitting saying yes or no every once in a while. After going through most of them she said that we could call it a night and then she went out for a smoke. I didn't wanna just sit in the kitchen alone while she was outside so I just went up to my room and kind of assume she would call me when she was ready to watch the movie with me. After like 20 mins of her not calling me I went downstairs to ask her when she wanted to watch the movie and found her watching a movie with my younger brother instead. I was kind of upset because I'm very rarely at her house and my brother is still week on / week off with her so I told her "I thought we we're supposed to be watching the movie tonight?" and I don't think I asked it in a rude way but maybe I did? She told me that I can't expect to do things with her if I just sit in my room all the time (I had hardly been in my room all day because I was helping her around the house and go through wedding photos most of the day while my brother did absolutely nothing) which kinda pissed me off so I went back to my room and texted my Dad. My dad told me I could come home early so I just packed up my things so that I could just get picked up by him after school the next day.

The next morning my mom made me sit down for a "family meeting" because she was mad that I sent texts from my brothers group chat to my dad (I sent them to her first and she didn't respond). She had asked something that I didn't quite understand and I thought she was talking about the movie and I said "well you were supposed to watch that movie with me last nigh" and to be fair there was definitely a little attitude when I said it which I can totally admit but she started yelling at me and said "well you can't expect me to drop everything when you're barely here". I don't feel like I was asking her to drop everything I just wanted to watch the movie with her that she promised that she'd watch with me. I'd feel different if she had already started the movie before I had gotten to her house or something but she literally started it while I was waiting to watch the movie with her. And if this was the first time she had blown me off to do things with my brother I probably wouldn't have reacted the same. I ended up just walking out to go to my bus stop and she asked me if I was coming back tonight and I just straight up told her no. On Tuesday night she texted me and said "sorry we didn't get to watch the movie you wanted. we will watch it next time you're home." which to me just feels insincere because she always texts me and "apology" after we have an argument (which is quite often) and they're never really actual apologies because they're usually just along the lines of "sorry you felt this way blah blah blah we'll try again next week". Although I do feel that I might have been an asshole in this situation because A) I'm a teenager and I know that teens aren't known for being the most rational B) I kinda just left when she was expecting me to stay another night at least and C) I am rarely there so like maybe my brother kind of deserved to watch a movie with her.

I'm really not sure if I'm the asshole in this situation so any opinions and maybe advice would be greatly appreciated! :)