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Yep. You just described my parents' marriage, till they couldn't stand being each other's tormentor/scapegoat anymore and finally separated in their senior years.
My parents too, unfortunately. I guess that's part of why I wrote: does LW really want to drag this out into years, decades, marriage, children, etc.? Life is hard enough. When you're a person of goodwill but there's no goodwill on the other side of the relationship to match your own, it's time to go. You can't change your partner; you can only leave the relationship, or join the game like our folks did.
It is a truly lousy way to live.
Indeed it is. Indeed it is. I hope LW does not continue to submit herself to it; she sounds like a wonderful, vibrant person who can do OH SO MUCH BETTER.