In answer to the original question: I have a personality disorder and attachment issues.
I am currently internally beating the ever living snot out of myself because I had about the best friend anyone could ever wish for (no, he was not a perfect human being, but he had a golden heart and was patient as the day is long) and, in hindsight (puzzling the bejesus out of me why I could not see my behaviour for what it was at the time), I see that I treated him like utter, absolute garbage. I have no explanation for it, and that scares me, and I'm so desperately trying to piece it together. And I cannot even tell him how right he was and how sorry I am and maybe create better days and memories... because he is currently dying in the hospital from a stroke and I cannot visit him, thanks COVID.
And, no. I'm not suicidal, just in case anyone worries. I just deeply, deeply hate myself for being such a hateful, ungrateful horror. Which I should. So hopefully, I can scrape my way to being someone better.
So yeah. I cannot imagine how fantastically catastrophic a romantic relationship would turn out with me. Rather continue to not find out.