Do I break up with my girlfriend?

Hey all, this might be a long one. I (24F) have been in a long-distance relationship with my girlfriend (29F) for 9 months. We’ve had issues from the start—early on, she’d ignore my texts for a day or more which lead to me treating her the same way and while we eventually addressed it, other problems kept surfacing.

She drinks heavily (despite having two DUIs) and has emotional outbursts, which are tough for me as someone more reserved. She’s shown up late to important events (my birthday dinner where she was meeting my friends for the first time - when I asked her about it she said she was hung over and was going to multiple pharmacies to find medicine, hence her lateness), gotten upset when I wasn’t in the mood for intimacy, and acted rudely toward others, like telling a waiter during a dinner with my college friend that she didn’t like him and basically caused a scene at the restaurant (she apologized for the behavior at the restaurant after I angrily confronted her but blamed her behavior on her having high expectations and people not meeting them).

She’s admitted to being an alcoholic and has stopped drinking as much since starting a new job, but her behavior still concerns me. For example, on Christmas Eve, she ignored my texts all day, only to accuse me of bad communication when I gave her a taste of her own medicine and didn’t reply on Christmas Day.

Today she sent me a text saying how upset she was about me not responding to her on Christmas Day. When I told I was giving her a taste of her own medicine, for lack of a better term, she explained that she was working from 7am to 6pm and didn’t see my text until the next day. So now I just feel bad, but at the same time I’m like you can’t accuse me of bad communication when your just as bad if not worse imo.

So here’s the dilemma, I’ve been thinking about breaking up for weeks and was ready to do it after Christmas, but I keep getting cold feet. I’m scared I’ll regret it, won’t find someone else, or that she’ll move on more easily. I also worry about losing a mutual friend. While she loves and cares for me, I’m unsure if things will truly change. She has horrific ADHD, and is honestly not responsible for her age at times I feel older than her. But again she’s really sweet and has helped me during difficult times. I just feel stuck and don’t know what to do. Do I give her another chance? We were supposed to see each other next week but never solidified plans. Some days I feel happy with her, but other days I don’t. I could go more in depth about things but don’t want my Reddit post to be a novel lol.

****UPDATE: I’ve broken up with her! I feel like a weight has been lifted from shoulders and honestly I don’t regret it (I spoke for literally three hours with my closest friends about it and they made me feel really secure in my decision). Thanks to everyone for the advice.