craft, the trump card that invariably seems to be played here is the man using his children as an excuse for not ending the marriage, so it's just not clear-cut black and white as you suggest. I admit I was a gullible prat, and learnt a tough lesson, but it was pure naivete on my part, just as it seems to have been with Lauren. Luckily I had some very close friends who helped me sort my life out when it all fell apart. What Lauren needs is support, not condemnation. That's why I say you're being harsh.
However, if she comes on here again in a few months saying either (a) she has got back together with him, or (b) she's taken up with another married man, I'll be at the head of the queue to give her a good slap!