I hate my ADHD and the problems it's causing in my relationship - Leminal Space

I might delete this later but I feel like shit. ADHD / my inability to get it under control to a level that works for my partner is destroying my relationship and I’m trying to work on my issues and find strategies and some things are getting better but it’s like our relationship has already been damaged beyond repair. One HUGE issue for us is me again and again forgetting something that’s important for my partner and them feeling deeply hurt as a result because they feel their needs don’t matter. But they do matter and I try to care for them as best as I can but I also keep forgetting things. And I also understand that this is extremely hurtful regardless of whether or not I’m doing it on purpose (which I’m not). My partner also suffers from strong migraines, so sleep is important to them. I know this. Bedtime is 10pm and when I’m out and have to be home by a certain time I will be (unless there’s something outside of my control). Last night I was an ADHD group for the first time. My partner asked me how long it would go. I told them it’s from 6 to 8pm. So - naturally - they assumed I would be home by around 8:40. They also insist that I said so, but I can’t remember that. When the meeting ended one of the other people walked up to me about something I said in the group because she has very similar experiences in her relationship, asked if we could stay in touch, and we chatted a bit. When I realized it was already 8:20 I told her I had to go and said good-bye. I then texted my partner that I unexpectedly ended up chatting with someone from the group and would be home by 9:15. To me that was okay because there would still be enough time to be in bed by 10. My partner however had wanted to go to bed at 9:30 because they’d already been up since 5:30 that day. I knew they had been up early and I knew they had an exhausting day the next but I did not put these things together and make the conclusion that getting up early could mean they’d also want to sleep earlier. If I had known that I wouldn’t have chatted with that other person. My partner insists that we agreed that I would be on my way home right away but from my perspective it wasn’t a definitive agreement. My partner then texted me back, telling me that they thought it was shitty of me to be late, that I still needed to do the dishes and that they had wanted to go to bed at 9:30 because they’d been up since 5:30. Perfectly understandable but I wasn’t aware of that because I have problems putting 1 and 1 together. I apologized but my partner remained angry. When I came home they told me they were going to lie down now (which in our area often also means going to sleep). I went outside quickly with the dog so she could pee and when I came back and saw there was still light in my partner’s room I started doing the dishes. They came outside super mad and asking me basically if I had lost my mind, why was I doing the dishes when they’d told me they’d wanted to sleep. I get that I should have asked if they’re going to sleep now right away or if I could still do the dishes and I tried to explain myself but they didn’t care. We ended up having a huge ugly fight where I also belittled their feelings because to me talking for 20 minutes and thus running late isn’t a big issue in the light of me not being aware that they’d wanted to go to bed earlier. I understand my partner being hurt again and again by my inability to perceive and remember their needs. I’m trying, I’m really trying to be considerate but I keep fucking up and I keep hurting them and I feel so fucking frustrated and deeply sad.