Can I join the Bear Hunt please? Not quite as relevant as the rest of you as my divorce was 13 years ago after 29 years together (23 married). How I wish there had been a Mumsnet then! (Perhaps there was but I didn't know about it).
From my perspective of 12 (well 14) years of separation and at the grand old age of 61, what have I learned?
(1) I should have kicked him into touch after his first affair instead of wasting another 8 years. (Mumsnet would have advised me better).
(2) I should not have agreed to stay together (knowing our divorce was inevitable) for a further 9 months. This was because our 2 DC were in their exam years, but in effect only benefited him by allowing him to go on dating sites to line up my replacement.
(3) I should have told both our families much sooner and not kept it all secret. He had his new gf (I can't help but think of her as OW although technically I suppose she wasn't) to confide in - I had nobody.
(4) I should have confided in my family about the first affair. My parents say now that they would have encouraged me to leave him and would have supported me.
Now I would have very different advice to someone in my position from the advice I gave myself over 20 years ago.
Oh ... and something else
(5) I should have got back to dating after a couple of years - I feel it is too late for me now. I am still happier alone than I was with him in those last 8 years though. It is good to know that you can be happy on your own - which I hope will be comforting for some of us.