Thank you so, so much. All the kind words I have received in these comments really mean so much to me.
I think by now my partner does grasp what having ADHD means. In the past she didn't really know what it meant and thought that ok people were maybe a bit more chaotic or forgetful.
But she has realized that the way my brain works is just fundamentally different and sometimes incomprehensible to her. And she knows me having ADHD means she has to put up with some things in order to be together with me but it's reached a point where there isn't really any, or hardly any, happiness left. She feels completely drained and constantly on the edge of depression. We have completely fallen into the "child-parent-dynamic" and she says being married to me is like being married to a teenager. Or having a child without having a child. Which in turn, I guess it goes without saying, has also pretty much killed any romance or attraction between us.
Yeah, I've been suffering from depression for around 1,5 years and am currently on antidepressants in addition to my adhd meds. Looking back on my life I can see how ADHD has always been there but I also think that my interpersonal relationships suffered as badly as they could have. I think I was often lucky. For example, I lost my first "proper job" because I kept forgetting important things. But regardless of that my boss liked me on a personal level, suggested that this job just wasn't for me and when I got a job at the same place but a different department we still got along great.
But my relationship with my wife had only been my second proper relationship and my first true long-term relationship and I feel like my ADHD was a ticking timebomb and when it went off it shattered everything.