i also think this way, but then i think there's a bit of a rebellious(?) part of me that is opposed; why should suicidality (b/c specifically that is what compels me to think that i'm unsuitable for healthy, reliable human connection) be isolationist to mitigate harm to other people? Nothing in life is completely controllable or responsible; there's always an element of risk and sometimes that's even romanticized.
There's the argument that perhaps those people who i could cut off would still hurt just as much if i ctb, irrespective of me cutting them off. Whether i cut those people off or not, the way the world is (in social attitude toward suicide/right to die), there will be no really peaceful, completely empathetic suicide option for me. (The only way that this will happen is if somehow there is dramatically more empathy toward/for suicidal people, and that it becomes acceptable to end your own life as you choose, with access to least-painful, least-violent means, perhaps in the company of loved ones.)
What i do strive to do, even at cost to myself, is not have other people rely on me materially. After a certain point, i don't think i can completely control whether someone relies on me emotionally, and i recognize adults in this reality suffer emotional damage or traumas as a fact of life-- and so when i think about the suffering that people who know me might endure upon learning of me killing myself, i do feel bad, but i would like to think that i can strive to strike a balance between some guilt and actually being patronizing toward other conscious, grownass adults who have endured suffering before and will do so in the future. Attempting to live in isolation is maybe the last unacceptable existence for me--at least for now.
For those who've cut people off, do you feel as though you've deliberately 'destroyed' relationships (i'd imagine ending them in such a way that memory / perception of even what was joyful about it is obliterated for yourself and the other person--via betrayal of some sort, maybe) or rather more simply 'ended' them (that is, you communicated a lack of present desire to continue, but it doesn't necessarily tarnish the memories of the active relationship)?