I am copying from that other thread:
"I think no-one would have predicted the impact it(ex's cheating) had on our kids, his siblings, me most of all
ex's siblings hate him for what he's done to me and his kids, however they can't say - oh well, we won't see him ever again
so I was avoiding christmases with them - my kids love going there as I have no family in UK
that is how they grew up - having christmases with their cousins, aunties, uncles, grandparents, so ex is there too, and I felt sick having to be with him in the same room on happy occasions like that
I love his family, they are on my side and now just over 4 years since I found out he was seeing someone else I can just about to be in the same room as him
he also decided to tell the kids - he had an affair, so my kids are torn between loving him and hating the same time
if you want to be hated by his family - carry on, but you will never be part of his life the way you would like to be
I also ended up with a bad depression for quite few months after we split. I would not wish that on anyone"