Pattern of conflict in my (26M) and partner's (35F) relationship
TLDR: communication issues in 8 month long relationship lead to escalation and break up threats
I've been with partner for nearly 8 months and at it's best, it's the nicest relationship either of us have ever had. I love her. We spend most of our weeks together, often cooking and drinking and watching films and have gone on great holidays.
I am not the best at communicating, I'm very introverted and quiet, and regulate emotions through space a lot of the time, find it difficult to verbalise how I'm feeling. Even i find it annoying and restraining. A few months in, she had a bad day at work and it just so happened for that one day I hadn't texted her asking how she was. Later on, she was very upset that I hadn't, because it turned out she'd had a bad day and needed some reassurance from me. She'd expected me to come meet her, though she hadn't explicitly asked me to, and called me up very angry. Another time, she was very stressed out by work and I told her she'd be okay and tried to reassure her, but she got very upset that I hadn't reassured her warmly enough and in the way she wanted and that she didn't feel close enough to me. Another time, seemingly out of nowhere, she confronted me saying I didn't do enough for her in general or meet her expectations of romance, even though I do my best to be physically affectionate with her, cook for her and help her around the house and go on holidays and dates with her - while working an intense hospital job and feeling burned out a lot of the time. Another time, I had plans to meet a close friend for coffee and she was upset I chose that over going on a date with her, despite making the plan already, she took it as evidence that I didn't care enough for her and didn't want to spend time with her, despite hanging out usually 5/7 days a week. She then explained it was less about me meeting my friend and more that she doesn't feel cared for enough by me. Another time it was my best friend's birthday and i wanted to stay a bit longer while she went home, and she got extremely upset that I chose to stay and didn't immediately text her hope you get home safe, taking it as a sign I didn't want to be with her or hang out. There are several other examples, and most of the times, she threatens to break up, and once i apologise, it goes back to normal. It leaves me feeling quite drained and anxious that I'm going to slip up again and lead to another argument after i've had a nice time.
This exact pattern has come up so frequently that I understand i could communicate better and more clearly, but I always end up doing something wrong unintentionally and she takes it as a sign I'm not there for her. I'm worried the pattern will just keep going no matter how harder I try at it, what would be a good course of action?