I may be in the minority but I actually believe his predatory behave is far worse than cheating.
He is a sexual predator, a pest, making other women feel so uncomfortable in their place of work, they had to complain.
Have you any idea how hard it is for women to do this?
Have you any idea just how uncomfortable she must have felt to make a complaint?
He was with them 17 years and dismissed him?
It must have been shockingly bad that they didn't give him a huge formal kickass warning that would have put the serious frightener's on him.
Or did they and he just ignored it?
He would make my skin absolutely crawl and he would never touch me again.
Regarding the children I would be clear that Daddy has behaved very badly at work, lost his job, and mummy no longer wants to live with him anymore.
Like hell would I take responsibility for the relationship ending because he is a predatory arsehole whose job fired him.
That poor colleague. Bet it isn't a once off too.