10 years later I still wonder if I would have stayed, had I had the luxury of hindsight.
My relationship with my DC has changed beyond recognition. When they first went to school, they had to be peeled off me by the teachers, then our divorce happened aged 12/15 and since then they have been v close to my ex (having previously only seen him weekends as he worked such long hours), and now, 10 years later, as adults, they live with him. It kills me every single day.
But could I have stayed with ex, who like your 'DH' wasn't abusive etc... I don't know.
I often wonder. I was v miserable in the marriage. But now I am very miserable about my relationship with my children. Last month the eldest turned 25. He wasn't bothered about celebrating, and went home from work to dinner (no doubt, celebratory dinner) with his sibling and Dad. I was tearful the entire day, but he pointed out to me it is his day, not mine. (I found that harsh).
I think nothing is ever perfect. I am in a wonderful relationship now, but, I don't have the same bond with my DC that I once had.
Because of the bond I had with them at the time of our separation, I didn't consider that this could happen (I had never heard of a Disney Dad!). I guess it could have happened anyway as they are boys and share many common interests.
(I think you've caught me on a particularly bad day... not every situation is the same), and I can't say for sure I would have stayed. But, I am not necessarily happier. Happier in a better relationship, but v gut wrenchingly devastated at the effect on my kids and our relationship.