Ignoring things like infidelity, abuse and deceit, how did you know your marriage was over? If it just got to the point where the marriage wasn't going to be fixable, what was it that made you realise that?
I hope no one minds if I don't explain about my own situation, suffice to say that, from where I'm sitting, it sucks. I think there are too many factors to try to put in one thread, and without the full picture, I don't think it's fair to ask anyone to have an opinion on what has happened / should happen.
I just feel the need to know what the tipping point has been for others, so I can try to use that as context and look at my own thinking objectively.